單項(xiàng)選擇題Start the turning gear, and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks （）, and with the control gear in the （）position, give the engine at least one complete turn.
A.open；“stop”
B.closed；“stop”
C.open；“start”
D.closed；“start”
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1.單項(xiàng)選擇題If the engine can be started and maneuvered on high viscosity fuel, the （）of the fuel reaching the injectors should be raised to such a point that the viscosity is less than the required value, ie27c St.
A.pressure
B.temperature
C.viscosity
D.density
2.單項(xiàng)選擇題On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so （） that the temperature of the piston cooling oil returns are 32℃ to 35℃ over a period of at least two hours.
A.slow
B.quick
C.arranged
D.high
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