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.

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.

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 drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.

In addition to lubricating, cylinder oil assists in for...

单项选择题In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.