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【单选题】
设示波器水平和垂直偏转灵敏度相同,在X、Y输入端加入同一个正弦波电压,则荧光屏上的图形是( )。A.
斜线
B.
椭圆
C.
圆
D.
水平直线
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【单选题】I didn't know your mobile number; otherwise I _____ you the second I got to Changsha. [ ]
A.
had rung
B.
would ring
C.
should have rung
D.
would have rung
【单选题】I _____ his telephone number. Had I known it, I would have rung him up.
A.
don’t known
B.
didn’t know
C.
hadn’t known
D.
haven’t known
【单选题】I was about to __________ the phone when it was _________. [ ]
A.
reply; rung off.
B.
receive; rung up.
C.
answer; rung off.
D.
answer;rung up
【单选题】证券市场按其职能(即纵向结构)划分,可分为( )。
A.
股票市场和债券市场
B.
场内市场和场外市场
C.
发行市场和流通市场
D.
国内市场和国外市场
E.
主板 市场和二板市场
【单选题】If you had rung up the TV repairman, you ____ the sports program.
A.
could watch
B.
could be watching
C.
could have watched
D.
could not watch
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