单项选择题
（）sometimes called filter, is a device designed to prevent the passage of unwanted solids into the system.
A.Steam trap
B.Check valve
C.Separator
D.Strainer
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A.lobe type
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单项选择题
When an auxiliary boiler is panting and emitting black smoke, you should （）.
A.increase the fuel oil temperature
B.decrease the fuel oil temperature
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单项选择题
Close the （）.
A.keyway
B.shaft
C.packing
D.valve
