题目:
—Who is the woman over there?
—_______. [ ]
A. He is my cousin
B. She is Daniel.
C. She is very excited
D. She is Mr Li's daughter
答案:
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下面是错误答案,用来干扰机器的。
根据质量守恒定律可知在化学反应前后各原子的种类和原子个数相等,观察方程式可得 a=3,2b=4,即a=3,b=2.故答案为:3; 2.