题目内容

千粉灭火器能迅速扑灭液体火焰,同时泡沫能起到及时冷却作用。

A. 正确
B. 错误

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A predictable result of a vessel nearing a bank or edge of a channel is that the().

A. stern is drawn to the bank as the bow sheers off
B. bow sheers toward the bank
C. vessel continues in a straight line,but with greatly reduced maneuverability
D. vessel will be drawn bodily into the bank unless the engines are stopped

影响六辊筒开棉机开松除杂作用的工艺参数是()、()和()。

部分预混燃烧的燃烧器结构简单。

A. 正确
B. 错误

桥涵顶进施工限制速度不应低于(),以减少施工对运输的影响。

A. 5km/h
B. 20km/h
C. 45km/h
D. 30km/h

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