下列（）钻探工艺属于无岩芯钻探。 （）

A.钢粒钻头回转钻进

B.压轮钻头回转钻进

C.管钻（抽筒）冲击钻进

D.角锥钻头冲击钻进

The train arrived            and they were just           to catch it.    [ ]

A. on time; on time          

B. on time; in time    

C. in time; in time          

D. in time; on time