《驾驶、轮机联系制度》规定,船舶到港前应对()进行()试验。
A. 主机/停、倒车
B. 锚机/抛锚
C. 汽笛/鸣放
D. 操舵装置/舵效
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One of the contribution of Theodore Roosevelt as President was()
A. the banning of child labor
B. the giving of voting right to women
C. in the field of natural conservation
D. in urban renovatio
6理想条件下,泵或风机的QT-HT性能曲线为抛物线形状。
A. 正确
B. 错误