道岔区段出现红光带（灯）不灭时，准备列车进路需扳动该道岔时，应将该道岔开通列车进路并

简述波浪能量损失？

不孕症的证型包括（）

A.肾虚证

B.肝郁证

C.二者都有

D.二者都无

随着时间的推移，归因会越来越具有情境性。人们会将过去很久的事件解释为背景的原因，而不是（）的原因。

A.行为主体

B.刺激客体

C.性别

D.年龄

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) .

钢轨是以每（）m长的钢轨重量来表示不同的类型。

A、1

B、10

C、20

D、100