A.0→初应力→103%σcon(持荷2min)→σcon
B.0→初应力→105%σcon(持荷2min)→σcon
C.0→初应力→105%σcon(持荷5min)→σcon
D.0→初应力→103%σcon(持荷5min)→σcon
有丝分裂原能使静止、不分裂的淋巴细胞进入活化、分化、增殖状态,能激活T.B淋巴细胞的是()
A、美洲商陆(PWM)
B、植物血凝素(PHA)
C、PNA
D、刀豆素(Con A)
入院率偏倚又可以称为
A.奈曼偏倚(Neymanbias)
B.出偏倚(detectionbias)
C.混杂偏倚(confoundingbias)
D.信息偏倚(informationbias)
E.伯克森偏倚(Berkson’sbias)
A successful lawyer usually has to talk to several () a day.
A.customers
B.candidates
C.interviewees
D.clients
试求:
(1)预应力筋张拉控制应力σcon ;
(2)确定张拉程序并计算单根预应力筋
A.Economy
B.Ambition
C.Prohibition
D.Economics