【判断题】用于制冷剂R12或R134a的空调压力表是不可互换使用的,原因是这两种制冷剂和冷冻油是不能混用的,否则会对空调制冷系统造成严重伤害。
【多选题】Western opera is a combination of
【单选题】Which part is Beijing Opera especially good at and very different from Western opera?
【多选题】Western opera is a combination of( ).
【单选题】This opera is one of the cultural _________ of Western civilization.
【单选题】听力原文:W: Well, Mr. Steve, we have had an interesting discussion about your work. Now, tell us something about your afar work activities. M: I guess not much different from everyone else. I'm fond of sp...