单项选择题
A.during the valve overlap period B.with only the exhaust valve open C.at a pressure below atmospheric D.without cooling the cylinders or pistons
To prevent vibration damage to the fuel supply line of ...
单项选择题To prevent vibration damage to the fuel supply line of a diesel engine, you may use （）.
A.a short length of heavy duty clear plastic tubing B.a length of approved flexible nonmetallic hose C.welded flange connections for all joints D.aluminum piping with expansion loops
When the prime movers of two paralleled generators are ...
单项选择题When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.
A.pick up more of any increase in load B.pick up less of any increase in load C.share an equal amount of any increase in load D.drop an equal amount of any decrease in load
Diesel engine jacket water is used in the distillation ...
单项选择题Diesel engine jacket water is used in the distillation process as the （）.
A.coolant for the distillate B.coolant for the brine cooler C.means of heating the feedwater D.primary means of producing a vacuum within the distiller
