·¢²¼Ê±¼ä : ÐÇÆÚÁù ÎÄÕÂ01-µ¥Ñ¡Ìâ-GSM¸üÐÂÍê±Ï¿ªÊ¼ÔĶÁ
(D) ·ÀÖ¹¶ÔÒѳ¬³öÐźŸ²¸Ç·¶Î§»ò·ÇÕý³£µôµçµÄÒƶ¯Ì¨½øÐв»±ØÒªµÄÑ°ºô¡£ 240. ÊÖ»úÏò»ùÕ¾·¢ËͲâÁ¿±¨¸æµÄʱ¼äÖÜÆÚ´óԼΪ£¿ (B)
(A) 1Ãë (B)0.5Ãë (C) 10ºÁÃë (D)2Ãë 241. ÒÔϹØÓÚCGI460-00-9558-12345µÄÃèÊö£¬ÄÄÏîÊÇ´íÎóµÄ£¿£¨B£©
(A)460Êǹú¼Ò´úÂë¡£
(B)00±íʾûÓÐÔËÓªÉ̵ÄÍøÂç¡£ (C)9558±íʾλÖÃÇø¡£ (D)12345±íʾСÇø¡£ 242. ÏÂÁÐÄÄЩÒòËØÄܹ»Ó°Ï쵽ϵͳµÄÇл»ÐÔÄÜ£¿(C)
(A) ƵÂʼ°BSIC¹æ»®.Âß¼ÐŵÀµÄÓ³Éä·½°¸¼°ÁÚÇø±íµÄ³¤¶È¡£ (B)¶à²ãСÇø¼äµÄÃÅÏÞÖµ¼°Âß¼ÐŵÀµÄÓ³Éä·½°¸¡£
(C)ƵÂʼ°BSIC¹æ»®.²âÁ¿´°¿Ú´óС¼°ÁÚÇø±í±íµÄ³¤¶È¡£ (D)ÉÏÃæÈý¸ö´ð°¸¶¼²»¶Ô¡£ 243. ×î´óÖØ·¢´ÎÊýMAXRETÒÔÊ®½øÖƱíʾ£¬È¡Öµ°üÀ¨£ºD
A. 4. 5. 6. 7 B. 1. 2. 3. 4 C. 1. 3. 5. 7 D. 1. 2. 4. 7 244. ¹ØÓÚBTSÔÚÇл»¹ý³ÌÖÐÈÎÎñµÄ˵·¨£¬²»ÕýÈ·µÄÊÇ£ºC
A. ¼àÊÓÿ¸ö±»·þÎñÊÖ»úµÄÉÏÐнÓÊÕµçƽºÍÖÊÁ¿ B. ¼à²â¸ÉÈŵçƽ
C. ²âÁ¿ÖÜΧСÇø½ÓÊÕµÄÐźÅÇ¿¶È D. °ÑBTSºÍÊÖ»ú²âÁ¿½á¹ûËÍÍùBSC 245. ÿ¸öÒƶ¯Óû§¶¼ÊôÓÚÒ»¸öÌض¨Ñ°ºô×飬ËüÊÇÓÉ ¾ö¶¨µÄ¡£B
A. Óû§µÄMSISDN B. Óû§µÄIMSI C. Óû§µ±Ç°ËùÔÚλÖÃÇø D. Óû§µ±Ç°ËùÔÚСÇø 246. 10. µ±BTS´«Ë͸øÊÖ»úµÄÐźÅÄÜÁ¿½Ó½üÊÖ»ú½ÓÊÕ»ú±¥ºÍ¶Èʱ£¬½á¹ûÊÇ ¡£D
A. ½ÓÊÕ»úÁéÃô¶ÈϽµ B. »°ÒôÖÊÁ¿±ä²î C. ÎÞÏßƵÂÊ×èÈûµÄ·çÏÕÉÏÉý D. ÒÔÉ϶¼¶Ô 247. ͬһ»ùÕ¾ÖÐÁ½¸ù·¢ÉäÌìÏßµÄ×îС¸ôÀë¶ÈӦΪ ¡£B
A. 20Db B. 30dB C. 40dB D. 50dB 248. µ±ÍøÂçÖÐÓÐÁíÒ»¸ö·¢Éä»úʹÓÃÓ뵱ǰÔز¨ÏàͬƵµãʱ²úÉú¸ÉÈÅΪ C ¡£
A. Ë«ÖظÉÈÅ B. »¥µ÷¸ÉÈÅ C. ͬƵ¸ÉÈÅ D. ·´Éä¸ÉÈÅ 249. ¹ØÓÚUm½Ó¿Ú˵·¨´íÎóµÄÊÇ£º
A. ÓֳƿÕÖнӿڣ¬ÓÃÓÚÊÖ»úÓëGSMϵͳ¹Ì¶¨²¿·ÖÖ®¼äµÄ»¥Í¨C B. ÊÇÊÖ»úÓëBTS¼äµÄͨÐÅ½Ó¿Ú C. ÆäÎïÀíÁ¬½Óͨ¹ýPCMÁ´Â·ÊµÏÖ
D. ´«µÝµÄÐÅÏ¢°üÀ¨ÎÞÏß×ÊÔ´¹ÜÀí. Òƶ¯ÐÔ¹ÜÀíºÍ½ÓÐø¹ÜÀí 250. ÓÃÀ´´«ËÍ¡°Location Updating request¡±ÐÅÏ¢µÄÐÅÁîÊÇ A ¡£
A. Initial MS Message B. ISUP C. DTAP D. BSSMAP 251. 15. µ±ÊÖ»ú×ö±»½Ðʱ£¬¹ØÓÚÕâ¸öÊÖ»úµÄÑ°ºô´Ó ·¢Æð¡£B
A. HLR B. MSC C. BSC D. BTS 252. ÔÚTEMS Investigation²âÁ¿ÖУ¬½ÓÊÕ³¡Ç¿£¨RxLev£©ÖгöÏÖºÚÉ«ÊúÏß±íʾ·¢Éú1´ÎÇл»£¬ÕâÌõºÚ
ÏßÓëµÚÈý²ãÐÅÏ¢ÖеÄÇл»ÐÅÏ¢¶ÔÓ¦£¬×¼È·µØ˵¸ÃÊúÏߵĶÔÓ¦ÐÅϢΪ£ºD A. Handover request B. Handover command C. Handover access D. Handover complete 253. TBF½¨Á¢µÄ¹ý³ÌÖв»»áÓõ½ÏÂÃæÄÇÖÖÐŵÀD
A. RACH B. AGCH C. PDTCH D. SDCCH 254. 19. PDP ¼¤»îÓëÈ¥¼¤»îÊôÓÚ ___²ãÐÅÁî. A
A. GMM B. BSSGP C. LLC D. SNDCP 255. Ò»¸öRLCÊý¾Ý¿éÊÇÓÉ_____¸öÁ¬ÐøµÄBURST×é³ÉµÄD
A. 1 B. 2 C. 3 D. 4 256. ÔÚ52Ö¡½á¹¹ÖÐ,PTCCHÔÚµÚ______¸öÖ¡ÖÐ C
A. 12,51 B. 25,51 C. 12,38 D. 25,38 257. ·ÖÅä¸øÒ»¸öÓû§µÄ×îСÊý¾Ýµ¥Î»ÊÇ____. B
A. FRAME B. BLOCK C. TIMESLOT D. TBF 258. ¼ÙÉèÓû§¼×ʼÖÕÔÚСÇøAµÄ¸²¸ÇÇøÄÚ£¬T3212A=20£¬¼×¿ª»úºó10·ÖÖÓ½ÓÌýÁË1¸ö3·ÖÖӵĵ绰£¬
´ËºóÔÙûÓнøÐкô½Ð£¬ÄÇô¼×µÄÊÖ»ú½«ÔÚ ·ÖÖÓºó½øÐеÚÒ»´ÎÖÜÆÚÐÔλÖõǼǡ£D A. 7 B. 107 C. 113 D. 120 259. ÓëÒ»¸öÔز¨ÅäÖúܶàµÄСÇøÏà±È£¬²ÉÓ÷äÎÑСÇøģʽ²¢½øÐÐƵÂʸ´Óýá¹ûÊÇ D ¡£
A. Ôö¼ÓÁËÐŵÀÀûÓÃÂÊ. Ͷ×ʺ͸ÉÈÅ B. Ôö¼ÓÁËÈÝÁ¿ºÍͶ×Ê£¬µ«ÊǼõÉÙÁ˸ÉÈÅ C. Ôö¼ÓÁËÈÝÁ¿£¬µ«ÊǼõÉÙÁËͶ×ʺ͸ÉÈÅ D. Ôö¼ÓÁËÈÝÁ¿. Ͷ×ʺ͸ÉÈÅ 260. ÔÚÍøÂç¹æ»®Öп¼ÂÇϵͳƽºâ£¨system balance£©Ê±£¬±ØÐë¼ÙÉè B ¡£
A. ÊÖ»úºÍBTSµÄÁéÃô¶ÈÏàͬ B. ÊÖ»úºÍBTSµÄ·¾¶ËðºÄÏàͬ C. ÊÖ»úºÍBTSµÄÌìÏßËðºÄÏàͬ D. ÊÖ»úºÍBTSµÄºÏ·Æ÷ËðºÄÏàͬ 261. Óû§·Ö×éÊý¾Ý·â×°¹ý³ÌÖÐδÉæ¼°µÄÍøԪΪ£¿£¨B£©
A£®MS B£®BSS C£®SGSN D£®GGSN 262. ý½é½ÓÈë¿ØÖÆ£¨MAC£©²ãµÄ¹¦ÄÜ°üÀ¨____¡£D
A ÔÚ·¢ËͶ˽«LLC PDU·Ö½â³ÉС¶ÎÊý¾Ý¿é,¶øÔÚ½ÓÊն˽«Ð¡¶ÎÊý¾Ý¿éÖØÐÂ×é×°³ÉLLC PDU B ÔÚÒƶ¯Ì¨ºÍSGSNÖ®¼äÌṩһÌõ¿É¿¿µÄÂß¼Á´Â· C Óû§Êý¾ÝµÄѹËõºÍ½âѹËõ
D ¶Ô·Ö×éÊý¾ÝÎïÀíÐŵÀ¹ÜÀíÒÔ¼°¶Ô·Ö×éÊý¾ÝÎïÀíÐŵÀÉϵÄÎÞÏßÁ´Â·Á¬½ÓµÄ¹ÜÀí 263. µ±Gs½Ó¿Ú±»ÒýÈëʱ£¬ÒÔÏÂ˵·¨²»ÕýÈ·µÄΪ£¿D
A£®µ±ÊÖ»ú×÷Attachʱ£¬½«·¢ÉúCombined GPRS/IMSI Attach B£®µ±ÊÖ»ú×÷Detachʱ£¬½«·¢ÉúCombined GPRS/IMSI Detach C£®Í¨¹ýSGSN·¢³öCSµÄPagingÏûÏ¢ D£®RAUµÄÇëÇó½«ÓÉMSC·¢³ö
A 10ms B 20ms C 30ms D 40ms 264. ΪÁ˸üÐÂÒƶ¯Ì¨µÄ¶¨Ê±ÌáÇ°Á¿»ò¹¦ÂÊ¿ØÖƲÎÊý,ÍøÂçÔÚPACCHÉϽ«____ÏûÏ¢·¢Ë͸øÒƶ¯Ì¨¡£B
A. PACKET MOBILE TBF STATUS
B. PACKET POWER CONTROL/TIMING ADVANCE C. PACKET SYSTEM INFORMATION TYPE 2 D .PACKET CHANNEL REQUEST 265. TCP/IPÐÒéͨ¹ý£¨ C £©À´Çø·Ö²»Í¬µÄÁ¬½Ó¡£
A.IPµØÖ· B.¶Ë¿ÚºÅ C.IPµØÖ·+¶Ë¿ÚºÅ D.MACµØÖ· 266. E-GSMƵ¶ÎÊÇÖ¸£¨ C £©
A.890 - 915MHz£»935 - 960MHz B.876 - 915MHz£»921 - 960MHz C.880 - 915MHz£»925 - 960MHz D.824 - 849MHz£»869 - 894MHz 267. 1. µ±½øÐÐ1800MÍøÂ縲¸Ç¹æ»®Ê±Ó¦²ÉÓõĴ«²¥Ä£ÐÍΪ£¨B£©
A.Okumura-Hata B.Cost231-Hata C.Cost231 Walfish-Ikegami D.Keenan-Motley 268. ¸ù¾ÝGSM¹æ·¶£¬Èç¹û»ùÕ¾µÄ½ÓÊÕÁéÃô¶ÈΪ-110dBm£¬ÄÇôΪÁ˱£Ö¤Õý³£¹¤×÷£¬ÆäÔØƵµÄµÚÒ»ÁÚƵ
¸ÉÈŵçƽ×î´óֵΪ£º£¨C£©
A.9dB£» B.-9dB£» C.-101dBm£» D.-119dBm
269. È«ÏòÕ¾ºÍÈýСÇø¶¨ÏòÕ¾ÔÚСÇø¸²¸Ç°ë¾¶ÏàͬµÄÇé¿öÏ£¬¶¨ÏòÕ¾¸²¸ÇÃæ»ý±ÈÈ«Ïò»ùÕ¾¸²¸ÇÃæ»ý
( A )
A.С B.´ó C.ÏàµÈ D.¶¼ÓпÉÄÜ 270. ijµØƵÂʹ滮ÖУ¬³ýÖ÷BCCHƵµãÍ⣬ΪTCH·ÖÅä6MƵ´ø£¬²ÉÓÃ1¡Á3ÌøƵ£¬Îª±£Ö¤Í¬»ùÕ¾ÄÚ²»
³öÏÖͬÁÚƵÅöײ£¬×î´óÕ¾ÐÍÅäÖÃΪ £¨ C £© A.S444 B.S555 C.S666 D.S777 271. ·¾¶ËðºÄ½µµÍ3dBʱ£¬½¼Çø»·¾³Ï£¬Ð¡Çø¸²¸Ç°ë¾¶Ôö¼ÓÔ¼ £¨ C £©
A.5% B.10% C.22% D.35% 272. µ±»ùÕ¾²ÉÓÃ΢²¨´«Êäʱ£¬ÐèÒª±£Ö¤²ÉÓÃ΢²¨µÄ»ùÕ¾Ö®¼ä£¨ A £©
A.ÊÓͨ´«²¥ B.µçÀë²ã´«²¥ C.ÑÜÉä´«²¥ D.·´Éä´«²¥ 273. Çл»¹ý³ÌÖУ¬ÏÂÃæÄÄÌõÐÅÁîÊÇÒì²½Ç뻶ÀÓеģ¿£¨ B £©¡£
A.HANDOVER DETECTION B.PHYSICAL INFOMATION C.HANDOVER COMMAND D.HANDOVER COMPLETE 274. GSM¹¦¿ØµÄʵÏÖÕë¶ÔµÄ×îС¶ÔÏóÊÇ£º£¨ C £©
A.СÇø B.TRX C.ʱ϶ D.»ùÕ¾ 275. ÓòâÊÔÊÖ»ú×÷·²âʱ²âÊÔÊÖ»úÏÔʾµÄTA²ÎÊýֵΪ20£¬Õâʱ²âÊÔµã¾àÀ뵱ǰ·þÎñ»ùÕ¾µÄÖ±Ïß¾àÀë
Ô¼ÊǶàÉÙ£¨¿ÉÖ±ÊÓ»ùÕ¾ÌìÏߣ©£¿£¨ B £© A.16Km B.11Km C.5Km D.8Km 276. ¹ØÓÚGSM 900.DCS 1800ºÍGT800ƵÂÊ·ÖÅ䣬ÒÔÏÂ˵·¨´íÎóµÄÊÇ£º£¨ C £©
A.P-GSM900Ƶ¶Î·¶Î§(MHz)£º890-915/935-960 ¾ø¶ÔƵµã·¶Î§£º1<=n<=124
B.R-GSM900Ƶ¶Î·¶Î§(MHz)£º876-915/921-960 ¾ø¶ÔƵµã·¶Î§£º0<=n<=124£¬955<=n<=1023 C.GT800Ƶ¶Î·¶Î§(MHz)£º806-821/851-866 ¾ø¶ÔƵµã·¶Î§£º360<=n<=435
D.DCS1800Ƶ¶Î·¶Î§(MHz)£º1710-1785/1805-1880 ¾ø¶ÔƵµã·¶Î§£º512<=n<=885 277. ¹ØÓÚGSMÔÀí£¬ÒÔÏÂÃèÊö´íÎóµÄÊÇ£º£¨ A £©
A.»°Òô±àÂ뷽ʽ³ÆΪ¹æÔòÂö³å¼¤Àø©¤©¤³¤ÆÚÔ¤²â±àÂë(RPE-LTP) Æä´¦Àí¹ý³ÌÊÇÏȽøÐÐ 8KHZ³éÑù£¬µ÷Õûÿ210msΪһ֡¡£
B.ÐŵÀ±àÂëÊÇΪÁ˼ì²âºÍ¾ÀÕý´«ÊäÆÚ¼äÒýÈëµÄ²î´í£¬ÔÚÊý¾ÝÁ÷ÖÐÒýÈëÈßÓ࣬ͨ¹ý¼ÓÈë´ÓÐÅÔ´Êý¾Ý¼ÆËãµÃµ½µÄÐÅÏ¢À´Ìá¸ßÆäËÙÂÊÐŵÀ±àÂëµÄ½á¹ûµÄÒ»¸öÂë×ÖÁ÷
C.½»Ö¯¼¼Êõʵ¼ÊÉϾÍÊÇ´òÂÒ¸÷¸öÂë×ÖµÄ˳Ðò£¬ÔÚGSMϵͳÖвÉÓöþ´Î½»Ö¯·½·¨ D.ÌøƵ¼¼Êõ¾ÍÊÇ·ûºÏƵÂʹ滮ÔÔòÏ£¬ÔÚ²»Í¬Ê±Ï¶·¢ÉäÔØƵÔÚ²»¶ÏµØ¸Ä±ä 278. GPRSÍøÂçÖÐMSÓÐÈýÖÖ²»Í¬µÄÒƶ¯ÐÔ¹ÜÀí״̬£¬ÒÔϲ»ÕýÈ·µÄÊÇÄĸö£¿£¨ D £©
A.IDLE״̬ B.STANDBY״̬ C.READY״̬ D.SUSPEND״̬¡£ 279. GSM¿ÉÒÔ»®·ÖΪ²»Í¬µÄÇøÓò£¬¸ù¾ÝÇøÓòµÄ´óС½øÐÐÅÅÐò£¬ÕýÈ·µÄÊÇ£º£¨ D £©
A.λÖÃÇø > PLMNÇø > MSCÇø > »ùÕ¾Çø > СÇø£» B.PLMNÇø > λÖÃÇø > MSCÇø > »ùÕ¾Çø > СÇø£» C.PLMNÇø > MSCÇø > »ùÕ¾Çø > λÖÃÇø > СÇø£» D.PLMNÇø > MSCÇø > λÖÃÇø > »ùÕ¾Çø > СÇø¡£ 280. Timing Advance°üº¬ÔÚÏÂÁÐÄĸöÐÅÁîÏûÏ¢ÖУº£¨ A £©
A.CHAN_ACTIV B.CHAN_REQ C.PAG_CMD D.SI1 281. ÒÑ֪ijСÇøµÄ²ÎÊýÅäÖÃÈçÏ£ºÀ©Õ¹´«Êäʱ϶ÊýΪ14£¬½ÓÈëÔÊÐí±£Áô¿éÊýΪ2£¬CCCHÅäÖÃÊÇ1¸ö·Ç
×éºÏCCCH£¬ÏàͬѰºô¼äÖ¡Êý±àÂëÊÇ2¡£Ôò´ËʱѰºô×éµÄÊýÄ¿ÊÇ£º£¨ B £© A.5 B.14 C.35 D.98 282. ÏÂÃæÄÄÒ»Ïî²»»áÓ°ÏìTCHÓµÈûÂÊÖ¸±ê£º£¨D£©
A.É豸¹ÊÕÏ B.µØÃæ×ÊÔ´²»¿ÉÓà C.µØÃæ×ÊÔ´ÒÑ·ÖÅä D.TCHÕ¼ÓÃʱÎÞÏßÁ´Â·¶Ï 283. ΪÁ˱ÜÃâÔÚÎÞÏß½Ó¿ÚÖÊÁ¿¶ñ»¯ÒԺ󣬱»Õ¼ÓõÄÐŵÀÎÞ·¨¼°Ê±Êͷŵ¼ÖÂ×ÊÔ´ÀË·Ñ£¬GSMÐÒéÔÚ»ùÕ¾
²àʹÓÃÁËÒ»¸öÓÃÓÚ¶ÔÎÞÏßÁ´Â·¼à¿ØµÄ¶¨Ê±Æ÷£¬¸Ã¶¨Ê±Æ÷Ϊ( C )
A.ÎÞÏßÁ´Â·Ê§Ð§¼ÆÊýÆ÷ B.ÏÂÐÐÁ´Â·¹ÊÕϼÆÊýÆ÷ C.SACCH¸´Ö¡Êý D.ÎÞÏßÁ´Â·Á¬½Ó¶¨Ê±Æ÷ 284. ÔÚʹÓÃANT·²âÉ豸µÄ¹ý³ÌÖУ¬½Ó¿ÚÐÒé±ØÐëÕýÈ·£¬GPSµÄ½Ó¿ÚÐÒé±ØÐëÉèÖóÉģʽ£º £¨ B £©
A.NONE/NMEA B.NMEA/NMEA4800 C.GRMN/GRMN D.RTCM/NMEA 285. ÔÚSDCCHÐŵÀÉÏ£¬Ò»¸ö²âÁ¿±¨¸æÖÜÆÚÊÇ£¨ A £©Ö¡
A.102 B.51 C.104 D.52 286. IMEI£¨¹ú¼ÊÒƶ¯É豸ʶ±ðÂ룩ÓÃÀ´Î¨Ò»Ê¶±ðÒƶ¯Ì¨£¬ËüÊÇÒ»¸ö£¨ D £©Î»µÄÊ®½øÖƱàÂë¡£
A.12 B.13 C.14 D.15 287. ÔÚGPRSÖУ¬ÊÖ»úµÄÒƶ¯ÐÔ¹ÜÀí״̬ÓÐÈýÖÖ£ºidle£¬ready£¬standby£»ÔÚ£¨A£©×´Ì¬ÏÂGPRSÊÖ»ú
ûÓи½×ŵ½GPRSÍøÉÏ¡£
A.idle B.ready C.standby 288. ÏÂÁÐÄÄÖÖÐŵÀ×éºÏÀàÐÍÊÇ¡°×éºÏBCCH¡±£¿£¨ B £©
A.FCCH + SCH + BCCH + CCCH
B.FCCH + SCH + BCCH + CCCH + SDCCH/4+ SACCH/C4 C.BCCH + CCCH
D.SDCCH/8 + SACCH/C8 289. µ±Ç°GSMϵͳËùʹÓõÄƵ¶ÎÊôÓÚÏÂÁÐÄĸöÎÞÏߵ粨²¨¶Î£¿£¨ C £©
A.ÌظßƵ£¨SHF£©£» B.Éõ¸ßƵ£¨VHF£©£» C.³¬¸ßƵ£¨UHF£©£» D.¼«¸ßƵ£¨EHF£©¡£ 290. GSMϵͳÖУ¬ÓÃÓÚÔ¤²â1800Mºê·äÎÑ·¾¶ËðºÄµÄ´«²¥Ä£ÐÍΪ£º£¨ C £©
A.Keenan-Motley£»B.Cost231 Walfish-Ikegami£» C.Cost231-Hata£» D.Okumura-Hata¡£ 291. ÔÚÊÐÇøÌìÏßµ÷ÕûÖУ¬¼ÙÉèÏÂÇã½Ç´óÓÚ´¹Ö±°ë¹¦ÂʽǵÄÒ»°ë£¬¸²¸Ç¾àÀëСÓÚÎÞÏÂÇãʱµÄ¸²¸Ç¾àÀ룬
¿ÉÒÔÍƵ¼³öÌìÏ߸߶ÈH(m).ÏÂÇã½Ç¦Á.ÌìÏß´¹Ö±°ë¹¦ÂʽǦÈ.¸²¸Ç¾àÀëD(m)Ö®¼äµÄ¹ØϵΪ£º£¨ A £© A.¦Á= arctan (H/D)+¦È/2£»B.¦È= arctan (H/D)+¦Á/2£» C.¦Á= arctan (D/H)+¦È/2£»D.¦È= arctan (D/H)+¦Á/2£» 292. ÊÒÄÚ´«²¥»·¾³ÓëÊÒÍâ΢·äÎÑ.ºê·äÎѲ»Í¬¡£Òò´ËÔÚ½øÐи²¸ÇÔ¤²âʱӦ²ÉÓõĴ«²¥Ä£ÐÍÊÇ£º£¨ D £©
A.Okomula-HataÄ£ÐÍ£»B.COST-231Ä£ÐÍ£»C.Longley-RiceÄ£ÐÍ£» D.Keenan-Motley Ä£ÐÍ£»E.Terrain Clearance AngleÄ£ÐÍ¡£ 293. ͨ³£Çé¿öÏÂ11dBiÈ«ÏòÌìÏߵĴ¹Ö±°ë¹¦ÂʽÇԼΪ£º£¨ B £©
A.3¶È£»B.7¶È£»C.9¶È£»D.11¶È¡£ 294. »ùÕ¾ÌìÏß´¹Ö±ÃæÄÚ²ÉÓø³Ðβ¨ÊøÉè¼Æʱ£¬ÎªÁËʹҵÎñÇøÄڵķøÉäµçƽ¸ü¾ùÔÈ£¬ ϸ±°êµÚÒ»Áãµã
ÐèÒªÌî³ä£¬²»ÄÜÓÐÃ÷ÏÔµÄÁãÉͨ³£ÁãÉîÏà¶ÔÓÚÖ÷²¨Êø´óÓÚ£¨ £©¼´±íʾÌìÏßÓÐÁãµãÌî³ä¡££¨ C £© A.-10dB£»B.-15dB£»C.-26dB£»D.-50dB¡£ 295. CW²âÊÔ£¨Á¬Ðø²¨²âÊÔ£©ÊǽøÐд«²¥Ä£ÐÍУÕýµÄ±Ø¾²½Ö裬²âÊÔÕ¾Ö·Ó¦·ûºÏÒÔϱê×¼£º£¨ A £©
A.ÌìÏ߸߶ȴóÓÚ20Ã×£¬ÌìÏ߸ßÓÚ×î½üµÄÕÏ°Îï5Ã×ÒÔÉÏ£» B.ÌìÏ߸߶ȴóÓÚ20Ã×£¬ÌìÏ߸ßÓÚ×î½üµÄÕÏ°Îï1Ã×ÒÔÉÏ£» C.ÌìÏ߸߶ÈСÓÚ20Ã×£¬ÌìÏ߸ßÓÚ×î½üµÄÕÏ°Îï5Ã×ÒÔÉÏ£» D.ÌìÏ߸߶ÈСÓÚ20Ã×£¬ÌìÏ߸ßÓÚ×î½üµÄÕÏ°Îï1Ã×ÒÔÉÏ¡£ 296. ʱ¼äÉ«É¢Ö÷ÒªÖ¸µ½´ï½ÓÊÕ»úµÄÖ÷ÐźźÍÆäËû¶à¾¶ÐźÅÔڿռ䴫Êäʱ¼ä£¨´«Êä¾àÀ룩²îÒì¶ø´øÀ´µÄ
ͬƵ¸ÉÈÅÎÊÌ⣻GSMÐÒé¹æ¶¨½ÓÊÕ»úµÄ¾ùºâÆ÷±ØÐë¾ßÓУ¨ £©Î¢ÃëµÄʱ¼ä´°¡££¨ C £© A.8£»B.10£»C.16£»D.32¡£ 297. ·Ö¼¯¼¼Êõ°üº¬¿Õ¼ä·Ö¼¯.¼«»¯·Ö¼¯.½Ç¶È·Ö¼¯. ƵÂÊ·Ö¼¯. ʱ¼ä·Ö¼¯¡£ÆäÖе±Òƶ¯Ì¨´¦ÓÚ¾²Ö¹×´Ì¬
ʱ£¨ £©»ù±¾ÉÏÊÇûÓÐÓô¦µÄ¡££¨ C £©
A.¿Õ¼ä·Ö¼¯£»B.¼«»¯·Ö¼¯£»C.ʱ¼ä·Ö¼¯£»D.ƵÂÊ·Ö¼¯¡£ 298. ¿Õ¼ä·Ö¼¯ÊÇÀûÓó¡Ç¿Ëæ¿Õ¼äµÄËæ»ú±ä»¯ÊµÏֵġ£Éè²ÎÊý¦ÇÓëʵ¼ÊÌìÏ߸߶ÈhºÍÌìÏß¼ä¾àDµÄ¹Ø