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單項選擇題

During working of an air compressor, （） should be drained.

A.inter cooler
B.cylinder
C.outlet pipe
D.inlet pipe

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單項選擇題

Before starting an air compressor, It should be （）.

A.unloaded
B.primed
C.filled with water
D.greased

單項選擇題

Before starting an air compressor, It should be （）.

A.turned
B.oil level checked
C.filled with water
D.A and B