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单选题
The operating water is supplied under the （）of an oil separator.
A
sliding bowl bottom
B
bowl hood
C
bowl
D
filter units
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单选题What is the operating principal of a flash type evaporator?（）A
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单选题Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）A
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check your exhaustC
adjust cooling water temperatureD
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