Is this the place ______ he used to live?
A.where
B.which
C.that
D.on which
答案:A
下述慢性肺脓肿影像特征,哪项不对()
A.空洞大小、形态不一
B.可为单发大空洞
C.常有液平面
D.胸膜常增厚
E.常呈偏心性空洞
矿床的产状要素有哪些?