How did you __________ to Tian'anmen Square?[ ]
A. go
B. went
C. goes
答案：A
偏心夹具机构的主要特点是（）
A.自锁性较好
B.操作快速简便
C.扩力倍率大
D.在振动工况下夹紧力稳定
妄想
