风机运行过程中应随时监视润滑油的温度，一般认为油经轴承后温升为（）之间是正常。
A、14-20℃
B、低于20℃
C、低于70℃
参考答案：A
Effective teachers are those ________ the students they teach. They support them in ways that bring
out their best. [ ]
A. interested in
B. interesting to
C. are interested in
D. are interesting to
具有行血、补血功效的药物是（）
A.川芎
B.赤芍
C.鸡血藤
D.阿胶
E.茜草
