题目内容

挡烟垂壁是指用不燃材料制成,从顶棚下垂不小于()MM的固定或活动的挡烟设施。

A. 200
B. 300
C. 400
D. 500

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Each life preserver must be readily accessible to the person for whom it is intended while he or she is().

A. at work,only
B. in his or her berthing area,only
C. BOTH at work and in his or her berthing area
D. None of the above

我国燃料油的生产集中度如何?

齿轮箱第一次换油应在首次投入运行()h后进行,以后的换油周期为每运行()h。

点火提前呈过大状态时,气体膨胀压力将()活塞向上运动,使汽油机有效功率减小。

A. 推动
B. 强迫
C. 阻碍
D. 抑制

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