【单选题】Two rats are given exactly the same amount of electric shock. However, one rat hears a buzzer 10 seconds before each shock, while the other rat hears nothing. Which rat do you think has a worse physic...
A.
the rat that hears the buzzer and knows that the shock is coming
B.
the rat that gets no warning and cannot predict when the shock is going to come
【判断题】在冲压过程中,装卸工件时,脚可以一直放在脚踏开关上。
【简答题】三相电路端线与端线之间的电压称为( )。
【简答题】三相电源端线与中线之间的电压称为( )。