题目

I have two cats named Mars and Venus．Get it? My niece，Beth，thought of the names. They are so cute．Mars is bigger and Venus has long curly, fur． They are such great company! They are curious(好奇)about everything except for the cat window seat．My two furry friends have visited almost every place in the house. Until I got Mars and Venus 1 was having terrible problems with insomnia．1 would go to bed at midnight and lie there until 4 or sometimes even 5 in the morning．I was walking around during the nighttime，and couldn′t seem to find a way to get to sleep．After one night o一定条件下，在体积恒定的密闭容器中发生反应：N2(g)+3H2(g)2NH3(g) ΔH=-QkJ·mol-1，下列说法正确的是（ ）A.达到平衡时反应放出的热量可能达到QkJB.升高温度，逆反应速率减小C.当混合气体的密度不再发生变化时，说明反应达到平衡状态D.达到平衡时，v正(N2)=3v逆(H2)