更多"[单选题]It will ______ us one hour to "的相关试题:
[简答题]光纤纤芯折射率为n1=1.5，用OTDR定时装置测得信号从A点到B点往返的时间为15us，A、B两点的光纤长度是多少?
[单选题]光纤纤芯折射率为n1=1.5，用OTDR定时装置测得信号从A点到B点往返的时间为30us，A、B两点的光纤长度是多少(____)。
A.1000m
B.2000m
C.3000m
D.4000m
[不定项选择题]“Go through the gate one by one, please。”翻译成中文：（ ）。
A.请大家由此排队。
B.请大家按顺序上车。
C.请大家按顺序下车。
D.请大家按顺序排队。
[单选题]合并单元正常情况下守时精度范围为±（）us，对时精度应为±（）us
A.1、1
B.1、4
C.4、1
D.4、4
[判断题]某一试验波形,波前时间为250us,波长时间为2500us,该波形为标准操作冲击试验波形。
A.正确
B.错误
[单选题]如图所示,IS= 5A,当US单独作用时,I1 = 3A,当IS和US共同作用时I1为( )。
A.2A
B.1A
C.0A
D.3A
[单选题]What happens if one FWC fails?
A.A.All the warnings are lost
B.B.Only red warnings are lost
C.C.No warnings are lost
[判断题]PTP设备时间准确度应优于1us
A.正确
B.错误
[判断题]CME US522HD的摄像头支持防水
A.正确
B.错误
[单选题]SDH帧周期（）us。( )
A.15
B.25
C.125
D.250
[单选题]GPON的下行固定帧长为( ) us
A.60
B.80
C.100
D.125
[单选题]The manager accused one of the hotel servants ____ stealing the money. ( )
A. for
B. with
C. about
D. of
[单选题]—Putting on a happy face not only helps us make friends but also makes us feel better.
—______ ( )(
A. I'd love to
B. I agree with you
C. It's up to you
D. It's my pleasure
[单选题] My friend is visiting us next week, and I will ________ Shanghai.
A.see him off
B.show him around
C.give him a message
D.ring him up
[单选题]In the following four items， which one should not be the DME primary parameter of alarm ？（ ）
A.A、Reply delay
B.B、Pulse spacing
C.C、power
D.D、AC
power
supply
