机械能破碎的方法有:压碎、()、磨碎和击碎四种基本形式。
参考答案:劈碎
A. three quarters; are
B. three quarter; are
C. third quarters; is
D. third quarter; is
出生时坐高占身高的比例是()
A.47%
B.57%
C.67%
D.77%
E.87%