圆锥的体积比圆柱的体积小.______.
因为圆柱和圆锥是在“等底等高”的条件下,圆锥的体积是圆柱体积的13,而题干没有说到圆柱、圆锥的高和底,
所以无法比较大小,
故答案为:×.
The school _____ I visited the other day was not the one _____ I once studied. [ ]
A. that; which
B. which; where
C. where; which
D. where; where
数控机床的主传动系统有较宽的调速范围,一般Rn>()。
A.10
B.100
C.1000
D.10000