为增进讲授效果，讲授的内容要具有______
A．科学性
B．知识性
C．思想性
D．全面性
E．专业性
参考答案：A,B,C
曳引电动机运转时轴承温度不应超过（）。
A.60℃
B.70℃
C.80℃
I hear that Mrs.Lin has been with the translation of a French novel these months. [ ]
A.seized
B.devoted
C.attracted
D.occupied
