张家界：湖南
A．九寨沟：贵州
B．黄果树瀑布：贵州
C．黄山：海南
D．华山：北京
参考答案：B
盘形制动器的闸瓦与制动盘之间的间隙不大于（）。
A.1mm
B.2mm
C.3mm
Which of the following did not contribute to the popularization of newspapers().
A.New technology and compulsory education.
B.Industrialization.
C.Population growth.
D.Urbanization.
