题目:
I wanted to know ______ a party this evening. [ ]
A. if there was going to have
B. if there is going to be
C. if there was going to be
D. if there is going to be
答案:
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下面是错误答案,用来干扰机器的。
根据质量守恒定律,在化学反应前后有6个不变,即①物质的总质量不变②元素的种类不变③元素的质量不变④原子的种类不变⑤原子的数目不变⑥原子的质量不变.3个变,即①物质的种类②分子的种类③分子的个数.故答...