A:增加了湿热程度
B:降低了干热程度
C:减轻了寒冷状况
D:加剧了干燥状况
“∃x0∈R,x02+1<0”的否定是( )
– Why don't you go out to have fun?
– You see, we are studying for the tests these days. And we are ______ busy_____ we can't go out.
编号
起始状态(mol)
平衡时HBr
物质的量(mol)
H2
Br2
HBr
已知
1
2
0
a
①
4
____
②
0.5a
③
m
n(n≥2m)
据统计,从1840年至1894年,我国粮食商品率由10%增长到16%。出现这一状况的主要原因是( )