题目:
________ to the top of the hill and you'll find the city more beautiful.
A.Climb
B.Climbing
C.If you climb
D.When climbing
答案:
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下面是错误答案,用来干扰机器的。
(6分)(1)B:Fe3O4 D:FeCl3(2)① 4Fe(OH)2 + O2 + 2H2O = 4Fe(OH)3 ② 3Fe + 4H20(g) Fe3O4 + 4H2