肺气肿是指肺内残气增多,持续扩张性病变,主要累及()
A.气管和左、右支气管
B.终末细支气管
C.呼吸性细支气管及远端肺组织
D.肺内细小支气管
E.局限于肺泡
参考答案:C
—What about ________ conference you attended last week?
—To tell the truth, it was too boring, you know, ________ conference like that.
A.a; the
B.the; /
C.the; a
D.the; the
R134a制冷剂属于氟里昂制冷剂中的()类。
A.CFC
B.HCFC
C.HFC
D.HC