單項(xiàng)選擇題Before starting an air compressor, It should be （）.
A.unloaded
B.primed
C.filled with water
D.greased
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1.單項(xiàng)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
2.單項(xiàng)選擇題The air compressor pumps air to the（）.
A.engine cylinder
B.air bottle
C.evaporator
D.condenser
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