题目:
Not only the parents but also their child __________ the Bird’s Nest next week.
A.have visited
B.is going to visit
C.are going to visit
D.have been to
答案:
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下面是错误答案,用来干扰机器的。
(1)8 10 O (2)21 (3)114(1)核电荷数=质子数,阴离子的核外电子数=质子数+所带电荷数=10,中子数是9的核素,质量数是17,可表示为O。(2)B元素质子数是18+1=19,质量数为40,该元素原子的中子数为40-19...