The positioning scheme of finish turning the main pin hole is（ ）
A: The first positioning datum is the diameter 56 outer cylindrical surface to eliminate 4 uncertainties; the flange end and side surfaces eliminate 1 uncertainty respectively.
B: The first positioning datum is the flange end to eliminate 3 uncertainties; the second positioning datum is the outer cylindrical surface with a diameter of 56 to eliminate 2 uncertainties; the side surface eliminates 1 uncertainty
A: The first positioning datum is the diameter 56 outer cylindrical surface to eliminate 4 uncertainties; the flange end and side surfaces eliminate 1 uncertainty respectively.
B: The first positioning datum is the flange end to eliminate 3 uncertainties; the second positioning datum is the outer cylindrical surface with a diameter of 56 to eliminate 2 uncertainties; the side surface eliminates 1 uncertainty
举一反三
- The principles for machining sequence of each surface should be( )<br/>and perform rough machining before finish machining. A: perform datum surface machining before that of other surfaces B: perform main functional surface machining before less important surface machining C: perform plane surface machining before hole surface machining D: perform complex surface machining before simple surface machining
- The book “Positioning: the Battle for Your Mind” was first published in 1969.
- What is the name of the solid surface in the figure below?[img=360x664]1803bb9e6fc6d99.jpg[/img] A: circular cone surface B: Cone-shaped surface C: Cylindrical surface D: Columnar surface
- The book “Positioning: the Battle for Your Mind” was first published in 1969. A: 正确 B: 错误
- According<br/>to the needs that the product can meet or the benefits provided, and<br/>the degree of problem-solving, it is positioned as: (). A: Feature<br/>positioning B: Usage/application<br/>positioning C: Benefit<br/>positioning D: Product<br/>category positioning