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【单选题】
某正弦电压表u(t)=100 sin( 314t +45o )V, 则______。A.
T =100 s
B.
f =100 π Hz
C.
有效值为141 V
D.
初相位为 45º
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【单选题】Chang also said the franchise approach would have a great ________on local drug retail market.
A.
mission
B.
confidence
C.
impact
D.
commitment
【单选题】The Great Wall is called "Wan Li Chang Cheng" because it is a "Ten Thousand-li-long Wall".
A.
T
B.
F
【判断题】The Great Wall is called “ Wan Li Chang Cheng ” because it is a “ Ten Thousand-li-long Wall ” .
A.
正确
B.
错误
【单选题】听力原文：When did you last talk to Mr. Green? (A) I prefer it in red. (B) The presentation will last about 40 minutes. (C) Yesterday on the telephone. (11)
A.
B.
【单选题】A vessel not under command making way at night would show ______.
A.
two all-round red lights in a vertical line
B.
anchor lights and sidelights
C.
two all-round white lights in a vertical line，sidelights and a stern light
D.
two all-round red lights in a vertical line，sidelights，and a stern light
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