錾削较硬材料时,錾子的楔角约取()。
A、40°~50°
B、50°~60°
C、60°~70°
D、70°~80°
参考答案:C
以下哪项不是脱证的特点
A.目合口张B.手撒遗尿C.鼻鼾息微D.肢体强痉E.汗多肢冷
Developing the project schedule is often an iterative process. It determines the planned start and finish dates for project activities and milestones. Schedule development can require the review and revision of duration estimates and resource estimates to create an approved project schedule that can serve as a baseline to()progress.
A.analyze
B.track
C.level
D.extend