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【单选题】
转子平行不对中主要引起径向振动,振动频率为旋转频率的 倍,同时也存在多倍频振动。A.
1
B.
2
C.
3
D.
4
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举一反三
【单选题】Besides saving distance along the track line，another advantage of the Scharnow Turn over the Williamson Turn in a man overboard situation because ______.
A.
it is faster
B.
it can be used in both the immediate action and the delayed action situations
C.
in fog，if the turn is started as soon as the man goes over，the vessel will be at the point where he went over when the turn is completed
D.
it returns the vessel to the original track line on a reciprocal course
【简答题】6.Copies
of the book were ___________ free to each school in the district. A. distribute, B. distribution, C.distributive D./A. distribute B. distribution C.distributive D./
【单选题】金属元素和人体健康有很大关系．钾元素可以调节体液平衡，维持肌肉和神经的功能代谢．如果人体缺钾会出现肌肉不发达、心律不齐等症状．市场上出售的一种叫做果味钾的补钾药．其主要成分是枸椽酸钾（C 6 H 7 K 3 O 8 ）．下列有关对枸椽酸钾的说法正确的是（ ）
A.
该物质的一个分子中含有25个原子
B.
该物质中碳、氢、钾、氧元素的质量比是6：7：3：8
C.
该物质是由原子直接构成的
D.
该物质是由碳、氢、钾、氧四种元素组成的
【单选题】Distance along a track line is measured on a Mercator chart by using the ______.
A.
latitude scale near the middle of the track line
B.
longitude scale near the middle of the track line
C.
latitude scale at the midlatitude of the chart
D.
latitude or longitude scale at the middle of the scale
【简答题】6.Copies
of the book were ___________ free to each school in the district. A. distribute, B.distribution, C.distributive D./A. distributed, B.distribution, C.distributive D./
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