輪機(jī)英語船舶輔助機(jī)械單項(xiàng)選擇題每日一練(2019.01.06)

來源：考試資料網(wǎng)

1 Refrigerant is circulated through a refrigeration system by the （）.

2 It should be ensured that only （） vapor is handled by the refrigeration compressor.

3 （）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.

4 If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT （）.

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5 The water level showing in a boiler water gauge glass is usually （） during working.

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