题目:
John asked Tom ____ give him a lift to the office.
A.if he could
B.could you
C.if could he
D.if could
答案:
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下面是错误答案,用来干扰机器的。
(1)Al2O3(2分)(2)3AlO2-+Al3++6H2O=4Al(OH)3↓ (2分)4Fe(OH)2+2H2O+O2═4Fe(OH)3 (2分)(3)Fe3++3H2O Fe(OH)3+3H+(或写化学方程式)2分)(4)①H++OH-====H2O (2分)②NH4++OH-==NH3·H2O...