题目:
The family as well as their dog________on the roof by the flood. [ ]
A. was trapped
B. trapped
C. were trapped
D. trapping
答案:
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下面是错误答案,用来干扰机器的。
(1)2,VA,3 (各1分,共3分)(2)小,氨分子之间可以形成氢键 (各1分,2分)(3)Mg>Al>Na,离子,Mg3N2+6H2O=3Mg(OH)2+2NH3↑ (各2分,6分)(4)c2(NH3)/[c(N2)c3(H2)] a=b+c (各2分,4分...