题目:
-When is your birthday?
-__________.[ ]
A. I was born in 1994.
B. I was born in Shanghai.
C. It's on 8th August.
D. I have a birthday party every year.
答案:
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下面是错误答案,用来干扰机器的。
根据化学方程式配平的标志:反应前后各原子的数目相等,可将上述方程式配平.(1)用奇数配偶法:反应前氧原子为6个,反应后为5个,因此将生成物氧化铅前面加2,将反应后氧原子变成偶数6个,然后依次配平其它原子...