【多选题】When the westerners express the surprising, exciting,or fear, they usually say... ( )
【单选题】若轴的线速度v=20m/s时,油润滑的滚动轴承应采用____________密封。
【单选题】When the Westerners want to refuse the courtship from the other side, there is only one simple and short answer, “Nope”._______________
【判断题】When Chinese negotiate with Westerners they can persuade each of the members, while the westerners should only persuade the Chinese team leader.
【判断题】When the Westerners want to buy gifts, it is not uncommon for them to ask what you would like.
【单选题】若轴的线速度 v = 20 m/s 时,油润滑的滚动轴承应采用 ____________ 密封。
【单选题】若轴的线速度v=20 m/s时,油润滑的滚动轴承应采用____________密封。