外螺纹钻杆
参考答案:
两端具有外螺纹的钻杆。被代替的同义词:“外丝钻杆”。
Mr Black has ______ friends in that city because he never lives or studies there. [ ]
A. many
B. a few
C. a lot of
D. few
上例的货物进口的转关方式是( )。
A.提前报关转关
B.直转转关
C.自转方式的转关
D.中转方式的转关