单项选择题
A.head capacity to improve B.discharge to be reversed C.efficiency to decrease D.slippage to decrease
Water allowed to accumulate in the hydraulic system oil...
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
If an anchor windlass has been idle for some time, you ...
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
The color of the flame on a halide torch without any re...
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
