手提式灭火器挂在墙上，其顶部离地面高度不应大于多少米（）
A. 1.5米
B. 1米
C. 0.5米
D. 无所谓
查看答案
In order for the automatic lifeboat drain to operate properly（）.
A. the cap should be removed to drain the boat when it is waterborne
B. the cage must be free of rubbish or the ball may not seat properly
C. there is an automatic ball check located in a siphon tube
D. the small lever to release the rubber ball float must be turned counterclockwise
用（）来装标定高锰酸钾溶液。
A. 棕色酸式滴定管
B. 棕色碱式滴定管
C. 量筒
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