輪機(jī)英語(yǔ)船舶動(dòng)力裝置單項(xiàng)選擇題每日一練(2019.01.22)

來(lái)源：考試資料網(wǎng)

1 "Scavenging" on a diesel engine means （）.

2 Before being used the fuel service tank should be drained of （）.

3 When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.

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4 The primary duty of lube oil is to reduce （） between the working parts of an engine.

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5 The development of oils （） the increasing demands made by the steady rise in powers produced by modem diesels.

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