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【单选题】
船在静水中的航行速度是 1m/s, 笔直对河岸,恒定,河水靠近岸边的流速为 2m/s, 河中间的流速为 3m/s 以下说法不正确的是A.
因船速小于流速，船不能到达对岸
B.
船不能沿直线过河
C.
船不能垂直河岸过河
D.
船过河的最短时间是一定的
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举一反三
【单选题】46 he handed the medicine to the next musher, Shannon`s face was black from the extreme cold.
A.
Though
B.
Since
C.
When
D.
If
【单选题】The doctor did a lot to reduce the patient's fear ____ he would die of the disease. [ ]
A.
that
B.
which
C.
of which
D.
of it
【简答题】The maximum data rate of any single wireless link can be described by the shannon’s theorem which is related to the（）in hertz，and the（）on the channel A．signal frequency B．bandwidth C．carrier frequency...
【简答题】We are taking____________lesson. And it is __________Shannon's lesson.
【简答题】保函的有效期包括______和______。
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