与交流耐压试验相比，直流耐压试验的特点有( )。
A．介质变质程度小
B．试验设备轻便
C．对绝缘损伤小
D．易于发现设备的局部缺陷
参考答案：B,C,D
—What ________ did the country leave you after a year of your staying there?
—Well, I think what ________ me most was the friendliness of the people there. [ ]
A. impression; impressed
B. was impressed; impressed
C. was impressed on; impressing
D. had impressed; was impressed
血红蛋白（hemoglobin）
