輪機(jī)英語船舶輔助機(jī)械單項(xiàng)選擇題每日一練(2019.01.11)

來源：考試資料網(wǎng)

1 In a flash type evaporator, all saltwater headers are vented through individual vent cocks to the（）.

2 If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.

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3 On all vessels equipped with refrigeration units of over 20 cubic foot capacity, （）.

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4 The various pumps and lines are （） to some extent so that each pump can act as an alternative for another.

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5 If air at 95℃ dry bulb temperature and 50% relative humidity is conditioned to 75℃ dry bulb temperature and 50% relative humidity, it is an example of （）.

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