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水泥混凝土路面基层设置的目的是什么？

答案

参考答案：

防止或减轻唧泥，错台和断裂病害的出现；改善接缝的传荷能力及耐久性，提高抗冲刷能力；缓解土基不均匀冻胀或不均匀体积变形对面层的不利影响；为面层施工提供稳定的基础和工作面。

选择题

一项调查表明，近40%的青少年认为自己有很多用了不久便不再用的东西。这些东西是因一时冲动而买的，之后发现并非自己所需要，造成浪费。这启示我们应  [ ]

A．避免盲从，理性消费

B．发扬艰苦奋斗的精神

C．提倡适度消费

D．保护环境，绿色消费

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填空题



As always, I am pleased to be here at the National Press Club for my (1) Speech. This is the seventh time I have had the (2) to give this speech, and over the years I have talked about a wide range of issues: (3) , reading, setting high expectations, improving the teaching profession, and (4) the American high school -- to name just a few.
I have just returned from a five-day, (5) tour of schools in rural America. We started in Monroe, Louisiana, and finished (6) later in Paducah, Kentucky. What I noticed most about the trip was the weather. Every time I (7) my Success Express School Bus, the local people who came to greet me (8) that the record for (9) had just been broken in their community. In each place, the temperature was always between (10) degrees.
Now, I have very good people on my staff. But the next time we plan a (11) , I’m going to have a (12) on my staff. I took this bus trip through rural America to make an important point that the (13) of children in our nation’s small towns cannot be ignored. Twenty-five percent of all our school children live in (14) all over America.
When it comes to our children, let’s always remember that children everywhere have (15) and (16) . Yet, schools in small towns too often have to (17) because of limited resources and a (18) . On my trip I put a p focus on the issues that matter in rural America, with a particular emphasis on (19) schools, reducing class size, and overcoming the (20) .
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