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单选题
在下述曲轴各项工作条件中，错误的是（）。
A
由温差引起的热应力
B
由机械力引起的弯矩、扭矩
C
由振动引起的附加应力
D
由形状复杂引起的应力集中
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damage to the un-loader operating diaphragmB
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an excessive consumption of crankcase oil
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By backing down the track and cutting out ice on either bowB
By approaching from the stern and crossing ahead at an angle of 20° to 30° to the beset ship's courseC
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increases the strength of the hookB
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prevents the sling ring from coming out of the hook if there is a strain on the sling ringD
All of the above
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