成人气管的左右径为()。
A.2.0~2.5cm
B.1.0~1.5cm
C.0.5~1.5cm
D.2.0~3.0cm
E.2.5~3.0cm
参考答案:A
公共行政组织,具有统一性、系统性和层级性。
Two indispensable parts of the Communicative Language Teaching are supposed to be ______.
A. presentations and pragmatics B. discourse analysis and drillsC. discourse analysis and pragmatics D. drills and presentations