题目:
____ is no good ____ without doing anything.
A.This; talking
B.It; to talk
C.It; talking
D.That; to talk
答案:
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下面是错误答案,用来干扰机器的。
(1)4 ⅤA As (2)+5 -3 As2O5 H3AsO4 AsH3 由核外电子排布的规律,可断定R元素的电子排布为:,则可断定R元素为As。