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單項選擇題

鼓風(fēng)機前吸力主管順煤氣流向傾斜度為（）。

A.5‰
B.7‰
C.20‰
D.10‰

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單項選擇題

鼓風(fēng)機前吸力在（）PA為合適。

A.2000～3000
B.3000～4000
C.4000～5000
D.1000～2000

單項選擇題

鼓風(fēng)機及附屬電機振動不大于（）mm。

A.0.04
B.0.08
C.0.12

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