一个圆柱的体积是l2立方厘米,9个和它等底等高的圆锥的体积是多少立方厘米?
12×13×9,
=4×9,
=36(立方厘米);
答:9个和它等底等高的圆锥的体积是36立方厘米.
依赖性药物分几类()
A.二类
B.三类
C.四类
D.五类
E.六类
Don't be too _____ about things you are not supposed to know. [ ]
A. strange
B. amusing
C. curious
D. conscious