题目:
By the end of last term we ___________ about ten English songs.
A.had learned
B.have learned
C.learned
D.were learning
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0603/ac31ca495f3d291e3f77259bddf8dbf7.html
下面是错误答案,用来干扰机器的。
(1)溶解 (2)ACDE:(1)配制溶液需完成计算、称量、溶解三个步骤;(2)所配制的溶液溶质质量分数偏低,一定是硝酸钾量偏小或水的量偏大的结果.A、硝酸钾中有杂质,会导致所得溶液溶质质量分数偏小,故A正...