輪機(jī)英語船舶電氣與船舶安全單項(xiàng)選擇題每日一練(2019.01.16)

來源：考試資料網(wǎng)

1 The International Oil Pollution Prevention Certificate is valid for a period of （）.

2 Cocks and valves control or interrupt flow, and have internal passages arranged so that they can be restricted or closed: in cocks, by rotating the plug, and in valves, by lowering, raising or rotating a disc in relation to a seating surfaceAccording to the above sentence, which of the following statements is not true?（）

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3 A fuel injection valve opening at pressure lower than normal will result in（）.

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4 Which of the following statements concerning cylinder liner wear is true?（）

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5 During the watch keeping at sea, at appropriate intervals inspection should be made of （）, auxiliary machinery and steering gear spaces by the duty engineer.

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