有一个在松散地层中形成的较规则的洞穴,其高度H0=3.0m,宽度b=4.0m,地层内

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问题:

有一个在松散地层中形成的较规则的洞穴,其高度H0=3.0m,宽度b=4.0m,地层内摩擦角=30°,则这个洞穴顶板的坍塌高度为()。

A.10.78m

B.12.46 m

C.11.25m

D.13.09m

考点:注册土木工程师岩土工程专业知识注册岩土工程师专业知识下午试卷3
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生物圈的含义[ ]

A.地球上全部生物

B.地球表面全部生物及生活领域的总称

C.地球上一切适合生物生存的环境

D.由大气圈下层、土壤岩石圈表层和水圈组成

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如图是一种理想自耦变压器示意图.线圈绕在一个圆环形的铁芯上,P是可移动的滑动触头.AB间接交流电压U,输出端接通了两个相同的灯泡L1和L2,Q为滑动变阻器的滑动触头.当开关S闭合,P处于如图所示的位置时,两灯均能发光.下列说法正确的是(  )

A.P不动,将Q向右移动,变压器的输入功率变大

B.P不动,将Q向左移动,两灯均变暗

C.Q不动,将P沿逆时针方向移动,变压器的输入功率变大

D.P、Q都不动,断开开关S,L1将变亮

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Friendship—Seven Tips on How to Make Friends
Friendship is a very important human relationship and everyone needs good friends. Friendship offers companionship, improves an individual self-worth and promotes good health. However making new friends comes easy for some people but for many of us the process is difficult and requires courage. Below are some helpful tips on how to make and keep friends.
Associate with others. The first step to making friends is associating with other people. Health clubs, places of worship and charities are some places where you can meet new people and build friendship. But attending these places is not enough. You will need to make yourself known by becoming an active member.
Be cheerful. A smile on the face is a sure way to attract new friends as people are always drawn to a cheerful disposition. No one wants to keep company with someone who constantly looks upset.
Start a conversation. Starting a conversation is the second most important step in making new friends. Do not wait to be spoken to;you can always start the conversation. Being able to make small talk is a very useful skill in relating with other people regardless of the environment or circumstance.
Stay in touch. For a friendship to grow you need to stay in touch. There are several ways of staying in touch with your friends and these include SMS, phone calls and online social networking sites.
Do things together. Choosing friends with common interest is important in establishing friendship as these interests would always bring you and your friend together and hanging out will always be a pleasant experience. The less you have in common with your friend the more likely the friendship will not grow.
Let it grow. It is a good thing to stay in touch but try not to choke your new friend with calls, messages or visits as this would likely wear him or her out and eventually they may not want to be your friend anymore. The best friendships are the ones that grow naturally.
Enjoy your friendship. The best way to enjoy your new friends is to allow them to be themselves. Try not to be critical of them and try not to change them from who they are to what you want them to be.
Theme
Friendship, which has a positive (76) __________on people’s life, is a very important human relationship.
(77) _______
on making and keeping friends
Be (78)__________with people by going to public places. Take an active part in activities to create (79) __________for others to know you.
(80)__________a smile all the time to make others willing to get close to you.
Try to have a conversation with others (81)__________ of environment or circumstance.
Contact your friends in some ways, (82)__________ SMS, phone calls and online social networking.
Choose friends whose interests are (83) __________to yours, which will bring you pleasant experiences when you do things together.
(84)__________ calling or visiting friends too frequently and leave friendships grow naturally.
Remember not to find fault with or (85)__________your friends, and make them as what they are.
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某商业企业为工业企业代销货物,结账时按照销售额、销售量的一定比例向供货方收取返还收入,应按照平销返利行为的有关规定( )。

A.冲减当期增值税进项税金

B.计算销项税

C.征收营业税

D.计入营业外不征流转税

题型:单项选择题

《放射卫生技术服务机构管理办法》的主要依据是()。

A.职业病防治法

B.放射性同位素与射线装置安全和防护条例

C.放射诊疗管理规定

D.职业卫生技术服务机构管理规定

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