单项选择题
A.30%~95% B.25%~90% C.20%~80% D.25%~80%
A.30%~95% B.20%~95% C.30%~100% D.40%~100%
A.风机、燃料气 B.燃料气、风机 C.燃料气、泵 D.风机、泵
A.关闭燃料气总阀 B.熄灭加热炉炉火 C.打开加热炉副线阀 D.停原油泵
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