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
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In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.
A.additives
B.water
C.grease
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In a typical fuel system, the oil is stored in （） in the double bottom.
A.setting tanks
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In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.
A.a service tank
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