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【单选题】
已知图 a 所示机构的尺寸和件 1 以等角速度 ω 1 逆时针转动,其未完成的速度多边形和加速度多边形分别如图 b 和 c 所示。下列完成工作错误的做法为A.
构件 2 上的 C 2 点的速度影像 c 2 点 b 中的 b 点处，而其加速度影像 c' 2 点 c 中的 p' 点处
B.
构件 2 上的 D 点和 E 点的加速度影像点 d' 和 e' 如图 c 所示
C.
构件 2 在图示位置时其角加速度 α 2 为零
D.
构件 2 上的 D 点和 E 点的速度影像点 d 和 e 点， d 点 b 中的 b 点处 ， 而 e 点在过 d 点垂直于 pb 的上方
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