肺结核主要分为（）
A.原发型肺结核
B.继发型肺结核
C.血行播散型肺结核
D.急性粟粒型肺结核
E.急性肺结核
参考答案：A, B, C, D
用游标卡尺测量一直管的长度，用螺旋测微器测量该直管的外径，测量结果如果，直管长度为 cm，直管外径为 mm。
Peter says that the Whites are on holiday, but no one knows_____ .[ ]
A. where they have been
B. where are they
C. where are they from
D. where they have gone
