輪機英語船舶輔助機械單項選擇題每日一練(2019.01.17)

來源：考試資料網(wǎng)

1 Excessive scale formation in a distilling plant may result from （）.

2 A swing check valve is used in a pipeline to （）.

3 A reciprocating pump belongs to （） according to its working principle.

4 Anchor（） are used in some installations where the cable lifter rotates about a vertical axis.

5 In a radial piston pump, reversal and control of fluid flow are accomplished by moving the （）.

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