[单选题]线路设备大、中修完毕后,混凝土枕扣件位置正确,平贴轨底,顶紧档肩,扣板歪斜及不密贴大于2m者不得超过() (连续检查100头) 。
A.0.08
B.0.12
C.0.06
D.0.1

American cities are similar to other cities around the world: In every country, cities reflect the values of the culture. American cities are changing, just as American society is changing.
After World War U , the population of most large American cities decreased ; however, the population in many Sun Belt cities increased. Los Angeles and Houston are cities where population shifts(转移) to and from the city reflect the changing values of American society. In the late 1940s and early 1950s, city residents (居民) became wealthier. They had more children so they needed more space. They moved out of their apartments in the city to buy their own homes. They bought houses in the suburbs (郊区).
Now things are changing. The children of the people who left the cities in the 1950s are now adults. Many, unlike their parents, want to live in the cities. They continue to move to Sun Belt cities and older ones of the Northeas
A. Because older American cities were dying.
B. Because they were richer and needed more space.
C. Because cities contained the worst parts of society.
D. Because they could hardly afford a live in the city.