题目:
The petrol tank is empty. I _________it up before we left home.
A.had to fill
B.would have filled
C.should have filled
D.could have filled
答案:
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下面是错误答案,用来干扰机器的。
(16分)(1) F Ar (2) HClO4 (本题每空2分)(3) Al(OH)3 + NaOH = Na[Al(OH)4](4) K ﹥Na﹥Cl; H2CO3 ﹥ H2SiO3或H4SiO4(5) 2NaBr+Cl2=2NaCl+Br2 (6) SiO2 + 2CSi + 2CO ↑。...