问题
单项选择题
某土坡的挡土墙高4.5m，墙背填土为中密粗砂，排水条件符合规范要求，地表无超载，墙背填土表面倾角为18°，墙背与水平面夹角为78°，墙背表面与土体的摩擦角为土体的内摩擦角的一半，其主动土压力系数按查表法为（）。
A.0.5
B.0.54
C.0.6
D.0.64
答案
参考答案：B
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某土坡的挡土墙高4.5m，墙背填土为中密粗砂，排水条件符合规范要求，地表无超载，墙背填土表面倾角为18°，墙背与水平面夹角为78°，墙背表面与土体的摩擦角为土体的内摩擦角的一半，其主动土压力系数按查表法为（）。
A.0.5
B.0.54
C.0.6
D.0.64
参考答案：B
阅读下面短文，完成信息卡(每空一词) You must hear about earthquakes，but do you know what to do during and after an earthquake ？Here is some advice for you： Before an earthquake.It is necessary to prepare yourself and your family.All family members should know how to turn off gas，waterand electricity and know useful telephone numbers（doctor，hospital，police，119，etc）.Never put heavy things over beds.. During the earthquake.It’s important for each of you to stay calm.If you are indoors ，quickly move to a safe place in the room such as under a strong desk or a strong table.It can protect yourself from falling things.Stay away from windows ，large mirrors，heavy things and so on.If you are cooking，turn off the gas. If you are outdoors，move to an open area like a playground.Move away from buildings，bridges and trees.If you are driving ，stop the car as soon as possible .Stay in your car. After an earthquake.Once the shaking stops ，do not run out of the building at once.It’s better to wait and leave when it is safe. Check around you and help the people in trouble.If your building is badly broken，you should leave it.If you smell or hear gas ，get someone outside and open windows and doors.If you can do it safely，turn off the gas.Repeat it to the gas company.
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