Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of （） to develop their full strength.<br>A:the piston rods<br>B:the crank throws<br>C:the thrust bearings<br>D:the main bearings

Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of （） to develop their full strength.
A:the piston rods
B:the crank throws
C:the thrust bearings
D:the main bearings

出自：海船船员证

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