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举一反三
【单选题】下列不属于人的不安全行为的表现的是?
A.
不戴安全帽进入化工生产厂区
B.
巡检时候累了，坐在压力管道上休息一会
C.
车间地面上有个盖板没有盖上
D.
电器总是过载跳闸，采用铜线代替保险丝。
【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, t...
A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range