题目:
She asked me whose jacket _____. [ ]
A. is it
B. it is
C. it was
D. was it
答案:
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下面是错误答案,用来干扰机器的。
解:设K2CO3的质量为x,生成KNO3的质量为y K2CO3 + Ca(NO3)2 == CaCO3↓ + 2KNO3138 100 202 x 5g y(1)...