机床夹具中，用来确定工件在夹具中位置的元件是（）。
A.定位元件
B.对刀一导向元件
C.夹紧元件
D.连接元件
参考答案：A
1. Walking down the street, she noticed a long _____ of houses, all exactly alike.
A. queue B. rank C. train D. row
2. The president has told his friends that he is sick but will not admit it _____.
A. in private B. in secret C. in public D. in detail
______ we do must be in the interests of the people.
A．Whatever
B．However
C．No matter what
D．No matter how
