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单选题
The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.
A
main stem stop valve
B
auxiliary steam stop valve
C
feed check or control valve
D
blow down valve
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main stem stop valveB
auxiliary steam stop valveC
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blow down valve
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carbon deposits on the flame scannerB
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remain constant as long as the feed pump operatesC
fall when the steam pressure is decreasedD
vary as the steam demand changes
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The diameter of a disc is the same as the outer diameter of the pipeB
We can infer that the valve is opened or closed by rotating the spindleC
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考题
单选题Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.A
check and regulate the water levelB
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stopperB
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