中央处理器由()等部件组成。
A.运算器
B.控制器
C.外存
D.内存
参考答案:A, B
Two hundred multiples of seven are chosen at random, and 300 multiples of eight are chosen at random. Approximately what percentage of the 500 selected numbers are odd ?()
A. 20%
B. 25%
C. 40%
D. 5O%
E. 80%
装配式铭柱子吊装的竖向允许偏差是5m以下的柱身为()。
A.±10mm
B.±5mm
C.±20mm
D.±30mm