属于热风炉燃烧转送风操作步骤有哪些（）？ A.打开煤气调节阀和_爱下问搜题

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问题多项选择题

属于热风炉燃烧转送风操作步骤有哪些（）？

A.打开煤气调节阀和煤气切断阀（大闸）

B.打开冷风的压阀

C.开热风阀

D.开混风调节阀调节风温

答案

参考答案：B, C, D

选择题

— I told you that he would come to see you.

— Actually I had little doubt ______ it was true.

[ ]

A. whether

B. that

C. since

D. if

填空题

电阻R₁与R₂串联，总电阻是20Ω，其中R₁=5Ω，则电阻R₂的阻值是______Ω．