All spacemen must be able to bear acceleration.所有太空人都应能承受加速度.She said with a straight face she saw green spacemen in the back yard.她面无表情地说她在后院看到绿色外星人.There are five spacemen in the spaceship.宇宙飞船里有五个飞行员....
实验结果表明,磨屑热辐射流温度信号是较好的辨识砂轮磨钝的信号源.The experiment results show that the temperature of grinding chips thermal flow is useful signal source.介绍了井口磨屑分析法和工具接头磨损检测法的理论依据.The theory basis of abrasive powder analysis method and to...