机械式离合器操纵机构一般由踏板、拉杆、（）、分离套筒等组成。
A、总泵
B、分泵
C、分离叉
D、压盘
参考答案：C
等腰三角形的一个内角等于另一个内角的2倍，求顶角的度数。
Thousands of Haitians cheered as the Chinese medical team arrived, many of _____ even cried with joy. [ ]
A. those
B. them
C. whom
D. who
