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單項(xiàng)選擇題

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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單項(xiàng)選擇題

The color of the flame on a halide torch without any refrigerant present is （）.

A.blue
B.green
C.orange
D.purple

單項(xiàng)選擇題

The color of the flame on a halide torch without any refrigerant present is （）.

A.blue
B.green
C.orange
D.purple

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