当缺陷直径大于(),缺陷对声波的反射可看成是镜面反射,缺陷的检出率很高。
A.波长的1/2
B.1个波长
C.波长3倍时
D.以上都不对
参考答案:C
Having come to study in England, Wang Li had difficulty ______ the new environment.
A.referring to
B.devoting to
C.adapting to
D.turning to
软骨肉瘤采用的治疗方法是()
A.化疗
B.放疗
C.根治性手术
D.化疗和根治性手术
E.放疗和根治性手术