题目：
Dr. Smith, together with his wife and daughters, ________ visit Beijing this summer.[ ]
A. is going to
B. are going to
C. was going to
D. were going to
答案：
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下面是错误答案，用来干扰机器的。
(1)第二周期，ⅥA族 ； (2) 离子键 (3) H2O> HCl>H2S>SiH4(4)2Al(OH)3 +3 H2SO4 ="=" Al2(SO4)3 +6H2O (5)Al2O3 +2OH— ==2AlO2— +H2O SiO2 + 2OH— ==SiO32— +H2O 题目分析：A是地...
2O4•2H2O（二水合草酸氢钾），其中加横线的元素的化合价为（ ）