Tom spent as little time as he could ____ (play) computer games.
When did you arrive school this morning?
物质
密度kg/m3
比热容J/kg·℃
凝固点℃
沸点℃
水
1.0×103
4.2 ×103
0
100
酒精
0.8×103
2.4×103
-117
78
下列二次根式中,是最简二次根式的是( )
长方形内有两个相邻的正方形,面积分别为4、2,求阴影部分的面积.