No sooner had their latest product been put into market ________ it ________ by other similar

companies.[ ]

A. when; was modeled after                

B. then; was modeled  

C. than; was modeled after                  

D. when; was modeled  

股静脉注射时，正确操作方法是( )

A．病人仰卧，下肢伸直，并略外展

B．术者洗手后应常规消毒手指

C．用消毒过的手指固定股静脉

D．抽出暗红色血表示已达静脉

E．注射完毕，局部用无菌纱布加压止血数分钟