单项选择题

纯化器采用的是( )型号的分子筛

A.3X
B.3A
C.5X
D.13X

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Problems with the diesel engine fuel injection pump are usually caused by_____.A.improper adjustmentB.contaminated fuelC.kinked fuel linesD.excessive engine vibration

A.
A.improper
B.contaminated
C.kinked
D.excessive

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焊机的保护接地电阻应打入地里深度不小于（）m。A、2B、1C、0.5D、1.5

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