C曲线右移使淬火临界冷却速度(),淬透性()。
A.减小、增大
B.减小、减小
C.增大、减小
D.增大、增大
参考答案:A
Mary three of her classmates invited to the party. [ ]
A. as well; has been
B. and; have
C. as well as;was
D. as good as; were
A.只有相互接触且发生相对运动的物体间才可能产生滑动摩擦力
B.只有运动的物体才可能受到滑动摩擦力
C.受弹力作用的物体一定会受到滑动摩擦力
D.受滑动摩擦力作用的物体一定会受到弹力作用