刹车防滞系统的功用是什么()。
A.轮速高时,增加刹车压力
B.轮速低时,增加刹车压力
C.轮子热时,减小刹车压力
参考答案:C
He ________ a piece of waste paper, and put it into the rubbish bag. [ ]
A. picked up
B. threw away
C. looked for
D. handed in
立体裁剪的应用范围。