球磨机主要由筒体、中空轴颈和主轴承、给矿器和（）四部分组成。
参考答案：传动装置
—My brother fell off his bike and hurt his legs.
—______.[ ]
A. That's too bad
B. He is too careless
C. He should be careful
D. I am sorry to hear that
速溶茶的用水量为每100ml水加速溶茶3克为适。（）
