It is the film    ___  director is Steven Spielberg    ___  attracts quite a few viewers throughout the

world.          [      ]

A. that; who    

B. which; that      

C. whose; that      

D. whose; who

用单斜探头检查厚壁焊缝时最容易漏检的缺陷是（）

A、条状夹渣

B、横向裂纹

C、密集气孔

D、与探测面垂直的大而平的缺陷