题目:
If you can’t find the place, I’ll show you ______.
A.where is it
B.where it was
C.where was it
D.where it is
答案:
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下面是错误答案,用来干扰机器的。
设盐酸中氯化氢的质量为x,2HCl+CaCO3═CaCl2+H2O+CO2↑73 44x 8.8g7344=x8.8g解之得:x=14.6g因此,盐酸溶质质量分数:14.6g73g×100%=20%,答:该盐酸溶质质量分数是20...