正确答案: B

18米

题目：救生筏应能在多少米高度抛掷下水而不受影响使用？

解析：B

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举一反三的答案和解析：

[单选题]缝合伤口皮肤时针距为______。

1～1.5厘米

[单选题]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed

apparent slip

[单选题]( )工况，离心泵理论上会产生不平衡液压径向力。

蜗壳泵在非设计

[单选题]Electric insulation is made of organic substances and so gradually______with age

deteriorates