【名词&注释】
单向阀(check valve)、有效期(period of validity)、溢流阀(relief valve)、圆锥体(cone)、机动船(motor vessel)
[单选题]In the absence of external forces，adding weight on one side of a floating vessel causes the vessel to ().
A. heel until the angle of loll is reached
B. list until the center of buoyancy is aligned vertically with the center of gravity
C. trim to the side opposite TCG until all moments are equal
D. decrease draft at the center of flotation
查看答案&解析
举一反三：
[单选题]一个单向阀和一个溢流阀可组合成( )阀。
A. 平衡
B. 调速
C. 卸荷
D. 背压
[单选题]根据ISM规则规定，DOC的有效期为______。
A. 4年
B. 5年
C. 3年
D. 2年
[单选题]你船是机动船(motor vessel)在试航，看到从左舷60度驶来一艘挂有尖端向下圆锥体的帆船与本船航向交叉，致有构成碰撞危险，你船应：
A. 保向保速
B. 右转给他船让路
C. 左转给他船让路
D. 视情况可右转、左转或减速、倒车、停船给他船让路
[单选题]An alternator is being paralleled with one on the line At the instant the circuit breaker is close, the frequency of the incoming alternator will normally
A. increase
B. not change
C. decrease
D. be exactly 60 hertz
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