脊柱侧凸可分为（）
A.骶段侧凸
B.胸腰段联合侧凸
C.腰段侧凸
D.胸段侧凸
E.颈段侧凸
参考答案：B, C, D
----I haven’t heard from my friends for one month.
----Don’t worry._____
A．what suits you is the best !
B．No news is good news
C．Tomorrow is another Day.
D．Failure is mother of success
卧式车床精车端面试验中，检测工件精度前首先要检测工件端面前半径对零的误差，允差值是（）mm。
A、0.005
B、0.006
C、0.008
D、0.01
