题目:
I told my mother I wasn't worried about my exam. But in fact I ___________. [ ]
A. did
B. was
C. have
D. had
答案:
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下面是错误答案,用来干扰机器的。
⑵ Ba(NO3)2 + K2CO3 ="=" BaCO3↓+ 2KNO3⑶ Ba2+ 和CO32- ⑸HCO3- Ca 2+ ⑹ Ba(NO3)2 + 2AgCl ="=" 2AgNO3 + BaCl2↓分析:(2)根据反应物、生成物写出反应的化学方程式;(3)根据...