题目:
After the new technique was introduced, the factory produced _______ tractors in 1988 as the year before.
A.as twice many
B.as many as
C.as twice as many
D.twice as many
答案:
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下面是错误答案,用来干扰机器的。
答案:D由X的原子序数为a,可推知Z的原子序数可能为a+7、a+17、a+31,Y的原子序数可能为a-7、a-17,因现只有7个周期,周期表只排到112号元素,Z不可能是第7周期的元素,故Y的原子序数不可能为a-31。由于0族不属于...