问题描述：
[单选]
A crankshaft whose center of gravity coincides with its center line is said to be（）．
A．dynamically balanced
B．statically balanced
C．counter balanced
D．resonantly balanced
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答案解析：无
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上一篇：The amount of fuel injected in a particular time， or degree， of crankshaft rotation is termed（）．
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（2）viscosity of the fuel oil
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