《煤矿安全规程》要求采易自燃和自燃煤层时，采煤工作面必须采用后退式开采。

控制性降压的适应证不包括

A．降低血管张力

B．减少渗血，使手术野清晰

C．控制麻醉期间的血压过度升高

D．预防躁动

E．减少出血

When the musical sound rings you, you immediately reach for your pocket ready to have a chat．But although you probably use it all the time, have you ever stopped to think about the manners related to talking on the phone? If you haven’t, here are some tips to guide you．

●Always give the person you are calling plenty of time to get to the phone before you hang up．If the person who answers is not the one you want，give your name and ask if you may speak to the person you want．

●Think about the time you call people．Try not to call too early in the morning（before about 9:00）or too late at night（after about 9:30）．Also try not to call at mealtimes．

●If you go by plane to visit your relatives at Christmas, remember to follow airline instructions．Cell phones must be turned off as soon as the plane doors are closed and remain so until the doors open again on arrival．

●When face to face with someone, do not talk on the phone．It is rude to be on the phone when a waiter is trying to take your order in a restaurant, or when you are returning the shoes you have just been trying on in a shop．Finish any face-to-face business before taking a call．Continuing to use the phone while nodding to the person in front of you is quite impolite．

●When in a restaurant with your friends，keep phone conversations short．Make a call only if it is important．Practise speaking in a low voice．If no one looks your way, you’ve got it．

●If you go to a theatre, a concert or a cinema, consider the other people around you．Check that your phone is “off” before you enter．If you are expecting a very important call, put your phone on “vibrate”（振动）and run for the exit as soon as you feel it．If you forget both “off” and “vibrate” and your phone rings, don’t answer it, turn it off straight away．

小题1:Which is true according to the passage above?

A．You may call people anytime as you like．

B．You may talk loudly on the phone at dinner in the restaurant．

C．You may keep on talking on the phone while greeting somebody．

D．You may call people as soon as you get on the plane，but not after the doors are closed．小题2:We may infer from these tips that__________．

A．some people don’t pay much attention to manners while making cell phone calls

B．you may ask to leave a message unless the person you are calling is in

C．calling people too early or too late in the morning is not polite

D．almost everyone has got a cell phone小题3:What does the underlined sentence “…you’ve got it” mean in the passage?

A．You have succeeded in making a call without disturbing others．

B．You have made the phone call brief and interesting．

C．You’ve got the message you are waiting for．

D．You have made a phone call secretly．小题4:From the tips given above, we can decide the writer is sure to share the opinion that______．

A．1ike the saying “clothes make a man”, nowadays cell phones make a man

B．as the old saying goes, money talks; nowadays cell phones talk

C．the way we use the cell phones tells what we are like

D．we are what cell phones we use

根据《建设工程施工劳务分包合同（示范文本）》，劳务分包人在施工场地内自有施工机械设备的保险手续应由（）办理，并支付保险费用。

A、发包人

B、工程承包人

C、劳务分包人

D、工程师

上楼梯的引导方法是什么？

旋启单瓣式止回阀的结构形式表示符号为（）。

A.4

B.2

C.1

D.5