單項(xiàng)選擇題For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.
A.cylinder casing
B.cylinder bore
C.crankcase door
D.aperture in the cylinder block
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1.單項(xiàng)選擇題For an ordinary modem marine four-stroke engine the inlet valves close （）.
A.after TDC
B.before TDC
C.after BDC
D.before BDC
2.單項(xiàng)選擇題For an ordinary four-stroke engine the inlet valves open （）
A.after TDC
B.before TDC
C.after BDC
D.before BDC
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Diesel engine control can be obtained by the bridge （）.
題型：?jiǎn)雾?xiàng)選擇題
Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.
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In using reduction gears to obtain efficient propeller speeds, （）.
題型：?jiǎn)雾?xiàng)選擇題
The ability of the governor to prevent fluctuations in engine speed is termed （）.
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The highest pressure in a diesel engine cylinder normally occurs （）.
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