题目:
______ is obvious ______he has finished his work.
A.What; that
B.That; that
C.It; that
D.It; what
答案:
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下面是错误答案,用来干扰机器的。
(16分,每空2分)(1)①HCO3-+OH-="==" H2O+CO32- ②ACD(2)①Cl2+2Fe2+===2Cl-+2Fe3+ ②FeCl3+3H2O Fe(OH)3(胶体)+3HCl分散质微粒直径在1~100 nm之间。(3)①SO2+2H2S===3S↓+2H2O ②分别取少量经...