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单选题
发动机的一部分，包括曲轴、主连杆总成、凸轮、凸轮传动齿轮、挺杆导套、滚柱、托架等。
A
The section of the engine which contains the sleeve, master and link rod assemblies, cams, cam drive gears, tappet guides, rollers, carriers, etc.
B
The section of the engine which contains the crankshaft, master and link rod assemblies, cams, cam drive gears, tappet guides, rollers, carriers, etc.
C
The section of the engine which contains the crankshaft, master and manifold assemblies, cams, cam drive gears, tappet guides, rollers, carriers, etc.
答案解析
正确答案：B
相关知识点：
发动机部分部件记准确
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