The microstructures were studied with optical microscope, X-ray diffraction,electron probe and glow discharge spectro scopy analysis.

用学显微镜、X-、探针及辉逐层分析等方法行了微观分析。

Objective To evaluate diagnostic value of CT Virtual Bronc ho scopy (CTVB) on deviant substance in trachea and bronc hia of children.

目的评价多层CT真支气管镜(CTVB)对儿童气管、支气管异物的诊断价值。