正确答案: B
4
题目:值班人员应每隔()h至少冲洗水位计一次。
解析:B
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[单选题]常见的泡沫灭火系统有压力定比型、________、预混型三种。
线路定比型
[单选题]“NE” stands for ________
north-east
[单选题]A thrust bearing is used with a propulsion diesel engine to ____.
control axial movement of the crankshaft
[单选题]落水者在水中切勿将衣服抛弃,因为衣服可以______。(1)做浮具(2)抗御寒冷和烈日(3)便于让救援者提拉
(1)(2)(3)
[单选题]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ___.
apparent slip
[单选题]货物的相容性是指()。
货物之间的反应可能