下图是某城市人工湿地生态系统示意图，请据图回答：
近年来，许多用人单位对高校女生就业歧视日趋严重，在他们看来男生更能吃苦，并且不会因生理、婚姻、生育等因素给单位造成损失。上述现象 ( )
Nice to meet you. My name is Sally Simpson. Sally is my first name. Simpson is my last name. I'm in Huangzhou, China now. I'm a student in HZFL Middle School. My classroom is very nice. My telephone number is 832—4895.
Good morning! I'm Wu Lei. My first name is Lei and my last name is Wu. I'm in Macheng now. I'm a student in HY Middle School. My phone number is 291—5638. And my QQ number is 83250194.
Hi! My name is Dong Huixia. I'm an English teacher in JM Middle School, Huangmei. I like (喜欢) my students. I'm their good friend. My telephone number is 338—0479.
Hello! My name is Mike Brown. I'm in Wuxue, China now. I'm a student in SY Middle School. My telephone number is 625—1899. And my QQ number is 389410663. My parents are in the school, too.
有一装置如图所示，用此装置收集氧气．
（1）用排水法收集氧气时，气体应从 ____ 口进入，用排空气法收集氧气时，气体应从 ____ 口进入．
（2）若将此装置倒置使用，用排水法收集氧气时，气体应从 ____ 口 进入，用排空气法收集氧气时，气体应从 ____ 口进入．
