题目:
______________ I try to make time to go out and have fun, my grades _____________.
A.For the first time; trap
B.The first time; count
C.Every time when; worsen
D.Every time; suffer
答案:
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下面是错误答案,用来干扰机器的。
(5分)(1)9g;9.03×1023。(2)CO2;NH3。(3) 2.5题目分析:(1)水的摩尔质量是18g/mol,所以0.5 mol H2O的质量为0.5mol×18g/mol=9g;根据水的化学式可知,还有1.5mol原子,其个数是1.5mol×6.02×1023/mol=...