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问题 单项选择题

贝克曼梁测定回弹弯沉，百分表初读数为51，终读数为26，那么回弹弯沉值为( )。

A．25(0.01m

B．25(m

C．50(0.01m

D．50(m

答案

参考答案：C

解析：
弯沉是指在规定的标准轴载作用下，路基路面表面轮隙位置产生的总垂直变形 (总弯沉)或垂直回弹变形值(回弹弯沉)，以0.01mm为单位。百分表初读数为51，终读数为 26，回弹弯沉值LT＝(L1-L2)×2＝(51-26)×2＝50。测点的回弹弯沉值按下式计算：
LT＝(L1-L2)×2
式中：LT——在路面温度为了时的回弹值；
L1——车轮中心临近弯沉仪测头时百分表的最大读数即初读数；
L2——汽车驶出弯沉影响半径后百分表的最大读数即终读数。
故选C项。

阅读理解
配对阅读。左栏是学生们的五种不妥行为或危险的情形，右边是老师所给出的七条建议。请搭配左右两栏。
小题1:Yesterday Li Hong found a strainger following her all the way. She ran home as quickly as possible.
小题2:Tom often uses earphones when walking outside.
小题3:It’s a long way from Wang Jun’s home to school, so he often sleeps all the way on the bus.
小题4:There are too many passengers on the bus today, and Li Feng puts his bag out of his reach.
小题5:The house is on fire and there is full of smoke in the house, and you are in it.
You should press the cut with a piece of cloth to stop the blood, then go to hospital as quickly as possible.
Don’t use earphones when walking outside. It’s dangerous to do so because you can’t notice those cars, buses or trucks back and forth.
Your bag should be put within your reach, or it is easy enough for the thieves to steal the things in your bag.
If you are followed by a stranger, cross the street and go in the other direction. Next, go and get help from others if it is necessary. Don’t go home directly. Your are safer on the street than you are in your home alone.
You can’t leave school by yourself. Don’t forget it’s safer in school yard than the outside world.
Don’t sleep on buses, or you may miss the right stop.
If your house catches fire and you have to escape through smoke, move on your hands and knees with your head 30 to 60 centimeters above the floor. Please remember there is cleaner and cooler air near the floor during the fire.
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