刃磨麻花钻时,钻尾向上摆动不得高出水平线,以防磨出负后角。( )
参考答案:对
I wonder how he _____ that to the teacher.[ ]
A. dare to say
B. dare saying
C. not dare say
D. dared say
CCC控制器最低控制速度为多少?为何要设置最低控制速度?