单项选择题
Water allowed to accumulate in the hydraulic system oil will cause an oxidation process producing by- products which are normally （）.
A.gums, acids, and varnishes
B.removed by cellulose type filters
C.neutralized by oil additives
D.not removed by absorbent filters
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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
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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
