單項(xiàng)選擇題
A.50 B.125 C.150 D.500
A.K2(b6-b8) B.K2(b2-b10) C.K2(b5-b8) D.K2(b1-b5)
A.VC-12-TU-12-TUG2-TUG3-AU4-AUG-STM-1 B.C-12-VC-12-TU-12-TUG2-TUG3-VC-4-AU4-AUG-STM-1 C.C-12-TU-12-VC-12-TUG2-TUG3-VC-4-AUG-AU4-STM-1
A.VC-12和TU-12指針全部為“1” B.整個(gè)STM-N幀內(nèi)除STM-N RSOH外全部為“1” C.整個(gè)STM-N幀內(nèi)除STM-N RSOH和MSOH外全部為“1”
A.1500 B.3000 C.6000 D.4500
A.34Mbit/s B.8Mbit/s C.STM-N D.STM-0
A.自由運(yùn)行(Free Running) B.保持(Hold Over) C.鎖定(Locked) D.跟蹤(Trace)
A.1x10E-11 B.1x10E-10 C.1x10E-9 D.1x10E-8
A.TS0 B.TS1 C.TS16 D.TS30
A.16mm2 B.20mm2 C.25mm2 D.35mm2
A.改變頻率或脈寬 B.將整流后的直流電變?yōu)楦哳l交流電整流后的直流電變?yōu)楦哳l交流電 C.濾除電網(wǎng)存在的雜波 D.將電網(wǎng)交流電源整流為平滑的直流電