麻花钻主切削刃上各点的后角是（）
A.内大于外
B.外大于内
C.相等
D.不变
参考答案：A
We went to the West Lake yesterday, _______, not surprisingly, was crowded with visitors from all
over the world. [ ]
A. where
B. which
C. that
D. when
大型真菌的营养类型分为哪几类，各自有哪些不同？
