数控切割的钢材利用率要比手工切割的钢材利用率()。
A.高10%~15%
B.相等
C.低10%~15%
D.低15%~20%
参考答案:C
The concert _______ many foreign students were invited was a feast for the eyes.
A.for which
B.to which
C.in which
D.on which
平地是指绝大部分地面坡度在()以下。
A、2度
B、3度
C、5度
D、10度