精车工件端面时，平面度超差，与______无关。
A．主轴轴向窜动
B．床鞍移动对主轴轴线的平行度
C．床身导轨
参考答案：C
-- It is fairly warm today.
-- So _____ and so _______ yesterday.
A．it is, was it
B．it is, it was
C．is it, was it
D．is it, it was
法律上的义务
