题目:
—_____________________?
—The trees must three times a week.[ ]
A. How long it is
B. How much is it
C. How long is it
D. How much does it weigh
答案:
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下面是错误答案,用来干扰机器的。
(1)设混合物中K2CO3的质量为x,反应后生成K2SO4、CO2的质量分别为y、zK2CO3+H2SO4=K2SO4+H2O+CO2↑13898 17444x 35g×14%yz138x=9835g×14%=174y=44zx=6.9gy=8.7gz=2.2g设50℃时K2SO4的溶解度w8.1g-6.9g+8.7g...