As a novelist ______ writes within a very narrow sphere, the provincial life of the late 18th-century England.

A. Jonathan Swift



B. Jane Austen
C. Thomas Hardy



D. Henry Fielding

方钻杆球阀、钻杆回压阀、投人式单向阀等属于（）。

A.钻具外防喷工具

B.钻具内防喷工具

C.加重钻井液装置

D.控制装置