平面铣削有几种铣削方式?
参考答案:
平面铣削主要采用周铣法,铣削方式分为逆铣与顺铣。
铣削时若铣刀旋转切入工件的切削速度方向与工件的进给方向相反称为逆铣,反之则称为顺铣。
小题1:Sydney Tower is ______ in Sydney, Australia.
A.the busiest street
B.the biggest station
C.the most beautiful park
D.the highest point小题2:If you Want to book a ticket to Sydney Tower, you can' t _______ .
A.email sydneytower@ hotmail. corn
B.fax 02 9333 9203
C.search www. sydneytower. com. au
D.dial 02 9333 9222小题3:Frank wants to go to Sydney Tower with his two children, he will pay ______ .
A.$60
B.$90
C.$120
D.$150小题4:Last Saturday, Johnson went to visit Sydney Tower. He had to get down the tower _____ .
A.after 11:30 pm
B.before 11:30 pm
C.at 10:30 pm
D.by 10:30 pm小题5:The passage above is probably________ .
A.a piece of news
B.a piece of news
C.a story
D.an advertisement(广告
猪发生玉米赤霉烯酮中毒时主要侵害()
A.神经系统
B.呼吸系统
C.消化系统
D.生殖系统
E.泌尿系统