多线电测仪可一次同时测量（）个不同电极距的（）曲线。
参考答案：四、电阻率
Not until he went through real hardship _____the love we have for our families is important.
A．had he realized
B．did he realize
C．he realized
D．he had realized
试述国务院直属机构的行政主体资格与职权范围。
