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輪機(jī)英語船舶輔助機(jī)械章節(jié)練習(xí)(2017.12.24)
來源:考試資料網(wǎng)
1
Which of the listed statements is correct concerning refrigeration systems?()
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2
The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as ().
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3
On small, low pressure, air compressors, the cylinders are usually lubricated by the ().
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4
In a refrigeration plant the () need defrosting.
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5
Which of the following statements concerning energy is correct?()
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6
Foaming in the steam drum may be caused by () in a boiler.
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7
A refrigerant boils and vaporizes in the () in a compression refrigeration system.
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8
R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refrigerantIt can, however, become highly toxic when ().
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9
In the condenser, the hot, high pressure refrigerant gas is cooled by the sea water and becomes().
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10
The degree to which the viscosity of an oil will change with a change in temperature is indicated by the ().
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