单项选择题
If an anchor windlass has been idle for some time, you should （）.
A.repack all valve stems
B.lubricate it prior to use
C.replace the foundation bolts
D.balance the warping heads
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相关考题
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单项选择题
The color of the flame on a halide torch without any refrigerant present is （）.
A.blue
B.green
C.orange
D.purple -
单项选择题
The color of the flame on a halide torch without any refrigerant present is （）.
A.blue
B.green
C.orange
D.purple -
单项选择题
If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be （）.
A.excessive condenser cooling water
B.warm food in the refrigerator
C.a shortage of refrigerant
D.s shortage of compressor oil
