湿材在空气中水份逐渐蒸发，会引起体积缩小称为（）。
参考答案：干缩
— The floor is dirty. Can anyone clean it?
— _______ I do it all the time. [ ]
A. Don't mention it.
B. Why you?
C. Not sure
D. Not me again.
A．副线圈中电压表的读数为55V
B．副线圈中输出交流电的周期为0.01s
C．原线圈中电流表的读数为0.5A
D．原线圈中的输入功率为110W
W