常用下肢静脉注射部位（）
A、大隐静脉
B、小隐静脉
C、足背静脉
D、股静脉
E、腘静脉
参考答案：A, B, C
After the accident a policeman was appointed to _________ the cause of the big fire.[ ]
A. look for
B. look after
C. look into
D. look upon
《焊工考核细则》中，管板角接头45°固定试件位置代号为（）
A.2FG
B.4FG
C.5FG
D.6FG
