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【单选题】
一对渐开线直齿圆柱齿轮连续传动的条件是 。A.
理论啮合线长度大于齿距；
B.
理论啮合线长度大于基圆齿距；
C.
啮合弧长度大于基圆齿距；
D.
实际啮合线长度大于基圆齿距。
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举一反三
【简答题】The importance of
voluntary organizations in maintaining public security still needs to be given ________.
【判断题】The overall dimension of a part in a certain direction needs not to be given in condition that the dimensions of each portion have already been given.
A.
正确
B.
错误
【单选题】Which vitamin needs to be given in supplemental doses in order to prevent deficiency when a patient is given prolonged administration of isoniazid(INH)?
A.
Vitamin A
B.
Vitamin K
C.
Thiamine
D.
Vitamin B6
E.
V itamin C
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