刨床、平面磨床、铣床夹具设计特点,老工件的尺寸精度要求要依靠()的调整来研究工作到。
A、夹具安装
B、工件安装
C、刀具回转运动
D、刀具和工作台直线运动
参考答案:D
My father admitted that when _____ comes to pop music, he had little knowledge of it. [ ]
A. he
B. that
C. this
D. it
瘀血致痛的特征之一是()
A.胀痛
B.固定痛
C.刺痛
D.绞痛
E.冷痛