下列哪些处理对于主动脉瓣关闭不全来说是有益的（） A.适当降低体循环阻力 B.保
题型：多项选择题
问题：
下列哪些处理对于主动脉瓣关闭不全来说是有益的（）
A.适当降低体循环阻力
B.保持稍快的窦性心律
C.适当增加前负荷
D.降低心肌收缩性
E.麻醉维持尽量少用氟烷
题型：多项选择题
You probably know you should say "please" and "thank you" at restaurants. You probably know the rules of a library. You know you should respect and be nice to your classmates. But do you have music manners?
Keep It Down! You have to notice the volume of your music. You should not play your music so loud that everyone around you can hear it. Some people might even get angry. Usually, when you play the music loud on an MP3 player, other people can't hear the words of the song. They just hear a loud sound. No one wants to listen to this. Very loud music can also be bad for your ears. So even if you are alone when listening to your MP3 players, you shouldn't turn it up too high.
Take Them Off! You need to know when to turn your MP3 off and put it away. Libraries, and schools don't allow MP3 players. There are other places, like museums, that don't have rules, but it would be rude to have your MP3 player on. Sometimes, it doesn't make sense to listen on your MP3 player at event. Why would you listen to music at a play, a movie or a sporting event? You would miss what is going on and others would wonder why you even came.
Take One Out! Once in a while it's okay just to take out one earphone and not the other. Imagine you are listening on your MP3 player when someone asks you the way. It would not be rude to take out one earphone, tell him the way, and put back the earphone and continue listening. You can also do this when you order food at a fast-food restaurant or when you answer the telephone
It's Your Choice! There are times when you need to decide what is best. For example, some people can listen to music on their MP3 players when reading books, while others think it is disturbing. In cases like this, you need to do what seems right for you.
小题1:The underlined word "volume" in Paragraph 2 probably means "_________."
A．the type of music
B．the length of a song
C．the amount of a sound
D．the color of an MP3 player小题2:We should turn down the music when we are alone because loud music_________.
A．may annoy others
B．can hurt our ears
C．is bad for MP3 players
D．will make us tired小题3:If we listen to our MP3 player at a play, _________.
A．the theatre won't allow it
B．the actors will get angry
C．others won't hear the play well
D．we may miss part of the play小题4:We can take one earphone out when we _________.
A．show others the way
B．enjoy a movie at the cinema
C．watch a sporting event
D．answer the telephone at museums 小题5:The main idea of this passage is about _________.
A．MP3 manners
B．music lovers
C．music players
D．MP3 earphones