使用跟刀架支承车削细长轴时，支承爪与工件接触松紧的调节是关键，若调节过紧，会把工件车成( )形。
A．腰鼓
B．锥
C．竹节
参考答案：C
微需氧菌，最适生长气体环境中需含氧5%、二氧化碳10%、氮气85%的细菌是（）
A.淋病奈瑟菌
B.大肠弯曲菌
C.肺炎链球菌
D.流感嗜血杆菌
E.卡他布兰汉菌
A.It was great. B.What’s the matter C.How about the green one D.Are you free tomorrow E.Thanks,but I am full.
A:How was your trip to Beijing B:______I spent four days in Beijing. Every day I did something different.
