影响金属材料切削性能的因素主要有()
A.力学性能
B.形状
C.尺寸
D.物理性能
E.化学性能
参考答案:A, D, E
—Do you think you can repair the car by yourself?
—______. It's not the first time for me.[ ]
A. Don't worry
B. Hurry up
C. Sorry, I can't
D. Not at all
19世纪英国“湖畔诗人”有()
A、华兹华斯
B、柯勒律治
C、席勒
D、骚塞