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单选题
Because the tie bolts are so close to the crankshaft, some engines employ （）to hold the crankshaft main bearing cap in position instead of conventional studs and nuts.
A
through bolts
B
jack bolts
C
tap bolts
D
fitted bolts
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单选题Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?（）A
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单选题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
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单选题To prevent excessive （） in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible.A
thermal stressesB
bending momentsC
thermal loadsD
surface tensions
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