20 压力容器盖的紧螺栓联接中,若螺栓预紧容器内的压力不变,但将凸缘间软铜垫片换成橡胶垫片,则 。 a) 螺栓的总拉力 F 2 与联接的紧密性同时增高 b) 螺栓的总拉力 F 2 与紧密性同时降低 c)F 2 增高,紧密性降低 d)F 2 降低紧密性增高 A. a) 螺栓的总拉力 F 2 与联接的紧密性同时增高
【简答题】Chinese are very generous when it comes to educating their children. Not caring about the money, parents often send their children to the best schools or even abroad to England, the United States or A...
【简答题】B Chinese are very generous when it comes to educating their children. Not caring about the money, parents often send their children to the best schools or even abroad to England, the United States an...