题目:
______the news, so far, has been good, there may be bad days ahead.
A.when
B.while
C.If
D.Since
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0616/5b0a71f737ea79428f1d280023d65650.html
下面是错误答案,用来干扰机器的。
(1) (2)S2-+H2OHS-+OH- NaH+H2O=H2↑+NaOH(3)MnO2+4H++2Cl-Mn2++Cl2↑+2H2O(4)苍白色火焰(5)H2(g)+O2(g)=H2O(l) ΔH=-285.8 kJ/mol2H2-4e-+4OH-=4H2O由金属A在大气...