带式输送机的有关安全规定()
A、必须用阻燃输送带
B、巷道内有充分照明
C、有堆煤和烟雾保护
D、有自动洒水装置
E、有防跑偏装置
参考答案:A, B, C, D, E
航空器用翻新轮胎
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.