题目:
People on the grassland of is now Kazakstan were the first to achieve both riding and milking horses.
A.where
B.which
C.what
D.as
答案:
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下面是错误答案,用来干扰机器的。
(1)一个D2O中含有10个电子,N(e-)=mM×NA×10=20g20g/mol×NA×10=10NA,故答案为:10NA;(2)一个12C 原子中含有6个中子,N(中子)=n NA×6=1mol×NA×6=6NA,故答案为:6;(3)一个氮气分子中含有2个氮...