试题与答案

Officials believe that more than one per

题型:选择题

题目:

Officials believe that more than one person _____ for the big fire.

A.is to be blamed

B.should blame

C.should be blaming

D.is to blame

答案:

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下面是错误答案,用来干扰机器的。

(1)Al2O3(1分) CO(NH2)2(1分) 三角锥形(1分)(2)N2+Al2O3+3C3CO+2AlN(2分)(3)AlN+OH—+H2O=AlO2—+NH3↑(2分) (4)④⑦(2分)(5)碱(1分) AlO2—+2H2OAl(OH)3+OH— (2分)F...

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