绝缘试验时，tgδ随温度增加而（）。
A.增加
B.不变
C.减小
D.先增大，后减小
参考答案：A
Because of the financial crisis, the total amount of export has ______ 40% in the first quarter of the year. [ ]
A. cut down by
B. reduced to
C. been cut down to
D. reduced by
舍曲林用于治疗（）
A．惊厥
B．帕金森病
C．抑郁症
D．痛风
E．记忆障碍
