正确答案: D

A+B

题目：船舶救生设备的有效性主要取决于______。

解析：D

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学习资料的答案和解析：

[单选题]舱底水泵常选用往复泵是因其( )。

自吸能力强

[单选题]立式烟管废气锅炉中牵条管的作用是( )。

A+B

[单选题]喷油器针阀座因磨损而下沉时对喷油器工作的影响是( )。

雾化不良

[单选题]Piston cooling fins are located

beneath the piston crown

[单选题]A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke

①

[单选题]地理坐标的基准线是：()

赤道、格林子午线