氯水用于消毒是因为
A.氯水中含有氯分子
B.氯水中含有次氯酸分子
C.氯水中含有氯离子
D.氯水中含有氢离子
答案:B
He reads newspapers every day _____ fall behind time. [ ]
A. not in order to
B. in not order to
C. in order not to
D. in order to not
服务的特点都包含下列哪几项?()
A.无形性
B.不可分离性
C.易逝性
D.异质性