电位是（），随参考点的改变而改变，而电压是绝对量，不随参考点的改变而改变。
A、常量
B、变量
C、相对量
D、绝对量
参考答案：C
－Tom _____ home at 5:00 in the afternoon.
A．gets to
B．gets
C．go
D．goes to
Treatments of heat exhaustion consist of（）.
A.moving to a shaded area and laying down
B.bathing with rubbing alcohol
C.placing the patient in a tub of cold water
D.All of the above
