下面的组织脱水剂是乙醇的良好替代品的是（）
A.丙酮
B.异丙醇
C.环己酮
D.正丁醇
E.叔丁醇
参考答案：B
His uncle has written some short stories, but he is ______ famous for his plays. [ ]
A. the best
B. more
C. better
D. the most
水泵叶轮检查时应注意哪些？
