夹紧力W、切削力F、工件重量G,加工时选择()时,所需夹紧力最小。
A.三力同向
B.W与、F、G反向
C.W与、F、G垂直
D.3种答案均不对
参考答案:C
-Do you think that housing price will keep ________in the years to come?
-Sorry,l have no idea. [ ]
A. lifting up
B. going up
C. bringing up
D. growing up
总体单位