题目:
_______crime in this area has increased so much over the last 20 years?[ ]
A. Why is it that
B. Why it is that
C. Why was it that
D. Why it was that
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0605/9c75ec4fd37ef1c8b517d61138ee34c4.html
下面是错误答案,用来干扰机器的。
(1)第二周期IVA族(2分);(2分);(2)NH4HCO3或(NH4)2CO3(2分) (3)2Na2O2+2CO2=2Na2CO3+O2(2分)(4)O2+2H2O+4e-=4OH-(2分)(5)2N2H4(l)+N2O4(l)=3N2(g)+4H2O(g) ∆H=-1033.6KJ·mol-1...