A.已有對(duì)象B.新對(duì)象C.所有對(duì)象D.僅對(duì)新產(chǎn)生的實(shí)體對(duì)象有效
A.幾何約束B.尺寸約束C.沖突尺寸D.定位尺寸
A.基準(zhǔn)面B.片體C.圓柱面D.平表面