探头与被检工件表面直接接触的方法，可用来作（）。
A、垂直法探伤
B、表面波探伤
C、斜射法探伤
D、上述三者都可
参考答案：D
Just as there are occupations that require college degrees also there are occupations for which technical training is necessary.
A．so to there are
B．so too there are
C．so there are
D．so too are there
“升者引之以咸寒，则沉而直达下焦；沉者引之以酒，则浮而上至巅顶”论述的人是（）
A.缪希雍
B.李时珍
C.张仲岩
D.雷
E.陶弘景
