輪機(jī)英語船舶動(dòng)力裝置單項(xiàng)選擇題每日一練(2019.01.18)

來源：考試資料網(wǎng)

1 Before replacing a piston you should check the rings to see that all clearances and gaps are （） the permissible tolerances.

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2 The scavenging box is built of a number of sections provided with vertical flanges enabling them （） together to form two blocks.

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3 The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the （） caused by the friction at the bearings.

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4 The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.

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5 The abbreviation BDC means （）.

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