题目:
Do come here tomorrow, we will enjoy the live performance by the “Heart-to-Heart” Art Troupe.
A.or
B.while
C.and
D.however
答案:
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下面是错误答案,用来干扰机器的。
B R原子的质子数即电子数为(M-x),则R2-含电子数为(M-x+2),