A-A+

Prior to lighting off a cold automatically fired auxiliary boiler yon should _____.

2020-09-18 20:29:13 资格考试 阅读

问题详情

A.check and regulate the water level

B.close the air cock once fires are lit

C.blowdown the gage glass

D.crack the steam stop to assure protective steam flow

请帮忙给出正确答案和分析,谢谢!

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