电阻器反映导体对电流起阻碍作用的大小，简称( )。
A．电动势
B．功率
C．电阻率
D．电阻
参考答案：D
The watch was very good, and he 20 percent down for it.
A．paid
B．cost
C．bought
D．Spent
砂浆抗压强度用压力试验的精度为（）
A.2%
B.1%
C.0.5%
D.1.5%
