在制订加工工艺规程时,划分加工阶段的作用之一是()
A.简化生产组织管理
B.可合理使用机床,使精密机床能较长时期地保持精度
C.缩短生产周期
D.降低加工成本
参考答案:B
女性,32岁。呼吸困难,心绞痛,查体可发现周围血管征,下列哪项不属于周围血管征()
A.毛细血管搏动征
B.脉搏短绌
C.枪击音
D.水冲脉
E.Duroziez双重杂音
Passage 2
Among the following factors, which contribute(s) to the short life expectancy of the Americans than Britons a. Traffic accident. b. Homicide rate. c. Inadequate access to the Medical Insurance by the Americans. d. Both A and B.