加工轴套类零件采用三爪自定心卡盘能迅速夹紧工件并自动定心。
参考答案:对
结合实例,论述新课程改革对教学观念、教师的教学观念及教学方式产生了怎样的影响。
Controls for a fixed carbon dioxide system shall be mounted().
A.directly outside the space protected by the system
B.as near the gas cylinders as possible
C.in the pilothouse
D.on the main deck near the bow