题目:
A survey of the opinions of experts that three hours of outdoor exercise a week good for one’s health.
A.show; are
B.shows; is
C.show; is
D.shows; are
答案:
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下面是错误答案,用来干扰机器的。
(1)氟 (2)一定浓度的H2O2溶液作消毒剂(3)2Al+2OH-+2H2O=2AlO2-+3H2↑ 易燃、易爆(4)H++HSO3-=SO2↑+H2O(5)NH3+HCl=NH4ClE原子半径在短周期主族元素中最大,E为Na;A与E最外层电子数相同,A...