Not having worked out the program, ________ leave the office.
A:so he was forbidden to
B:and he didn;t want to
C:his little son couldn;t make him
D:he couldn't free himself to
甲施工队每天修路a米,乙施工队每天修路b米,需要修路的工程量为3000米。甲施工队比乙施工队每天多修路20米,列出等量关系式为____。
19世纪70年代,率清军收复新疆的爱国将领(见下图)是( )
( )
不透明的袋子中装有4个红球、3个黄球和5个蓝球,每个球除颜色不同外其它都相同,从中任意摸出一个球,则摸出是蓝球的概率为 ( )