单项选择题
A.half the engine speed B.twice the engine speed C.the engine speed D.four times the engine speed
In an engine with air inlet valve and exhaust valve on ...
单项选择题In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.
A.downwards；upwards B.upwards；downwards C.downwards；downwards D.upwards；upwards
In an engine with a pot-shaped piston, some lubricating...
单项选择题In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.
A.telescopic pipes B.large bore C.drilled passage D.tied rod
单项选择题In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.
A.crosshead B.crankpin C.crank journal D.gudgeon pin
