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【单选题】
She has visited Hong Kong_______, but she wants to be there a_____ time.A.
two, three
B.
twice, three
C.
twice, third
D.
two, third
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反馈参考答案：
举一反三
【单选题】A vessel engaged in minesweeping on the high seas carries which of the following day signals ?
A.
Two green balls in a vertical line
B.
Two black balls in a vertical line
C.
A black ball at the foretruck and yardarm ends
D.
A shape of two cones point to point
【单选题】The door and the windows were all closed and there was no _____ of forced entry. [ ]
A.
scene
B.
signal
C.
sign
D.
sight
【单选题】Scientists are sure that the color red ______.
A.
encourages athletes wearing it
B.
is a signal of vigor
C.
is superior to the color blue
D.
delivers messages of mental advantage TEXT C
【简答题】在图示的电路中,已知 C =0.1mF 。 开关 S 闭合后电路的时间常数 为( )s。
【简答题】结核病的主要传染源是
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