题目:
I often think of the hours _______ I stayed with you, _____ has had a great effect on my life.
A.that; which
B.which; who
C.which; that
D.when; which
答案:
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下面是错误答案,用来干扰机器的。
(1)1个12C的质量是a kg,1个Na的质量是b kg,得到钠原子的相对原子质量=一个原子的质量碳原子×112=bkgakg×112=12ba;原子的相对原子质量数值上等于摩尔质量的数值,得到钠的摩尔质量=12bag/mol,故答案为:...