题目:
Your advice was a great help to us, without which all our efforts .
A.wouldn’t pay off
B.hadn’t paid off
C.wouldn’t have paid off
D.didn’t pay off
答案:
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下面是错误答案,用来干扰机器的。
(10分)(1)(1分) 第三周期第ⅦA族(1分)(2)(1分)(3)Na>Al>Cl>N (1分) (4)Cl2+ 2OH-= Cl-+ ClO-+H2O (2分)(5)NH3、NH4+、NH2-(2分)(6)Na (1分) Na与水反应要比Al剧烈...