国产第一页浮力影院,先锋天堂av在线网,国产区一区二区三区精品

1 During the PSC inspection, under the provisions of SOLAS 74, which one may not be regarded as clear grounds for ships’ detainment?（）

2 If a voltmeter is connected across a line, it must be protected with a（）

3 Which of the equipment listed is most effective in processing bilge slops for overboard discharge?（）

4 After finished the engine, which of valves cannot be shut off by the duty engineer?（）

5 In a simple mechanical governor, the （）

輪機(jī)英語(yǔ)船舶電氣與船舶安全單項(xiàng)選擇題每日一練(2019.01.25)