食管第二个狭窄距中切牙约()
A.15cm
B.25cm
C.30cm
D.40cm
E.45cm
参考答案:B
Choose the best response from A to F according to the sentences given.
小题1:How long have you been in this hospital?
小题2:What happened to your friend last Saturday afternoon?
小题3:You haven’t seen him for a long time ,have you?
小题4:May I ask you some questions on the accident?
小题5:What’s the highest mountain in the world?
黄豆酱制备检测样品时,应先研磨后再称量.