輪機(jī)英語(yǔ)單項(xiàng)選擇題每日一練(2019.07.26)

來(lái)源：考試資料網(wǎng)

1 The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains （）.

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2 The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the（）

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3 In order to release CO₂ to the machinery spaces from a fixed fire extinguishing system, you must（）.

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4 A pressure drop in the liquid line of a refrigeration system may cause（）

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5 The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the（）.

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