只从理论分析，按加工要求对工件限制的自由度数目最少为三个。
参考答案：对
— Have a good school trip!
— ______. [ ]
A. You are welcome
B. Don't say it
C. The same to you
D. Thank you
对家族性Ⅲ型高脂血症效果较好，且可以消退黄色瘤的药物为
A．苯氧酸类B．他汀类C．多不饱和脂肪酸类D．保护动脉内皮药E．烟酸类
