Jack had ______feeling of excitement when hearing his   article had been published in _____ school

magazine. [ ]

A.the;a    

B.a;the  

C./;the    

D.the;/

检查套管内径时，用直径小于套管内径（）毫米，长度为300～500毫米的标准内径规，逐根通过，通不过者为不合格。

A、1

B、3

C、5

D、8