引起支气管哮喘气流受限的原因不包括()
A.气道黏膜水肿
B.腺体分泌亢进及黏液清除障碍
C.肺泡弹性回缩力下降及肺泡破坏
D.气道平滑肌痉挛
E.气道壁炎性细胞浸润
参考答案:C
He was angry _____ your work. He said that he _____ at all.
A.at, didn’t satisfy
B.to, didn’t satisfy
C.at, wasn’t satisfied
D.to, wasn’t satisfied
用频数表法计算中位数时,要求()
A.组距相等
B.组距不等
C.组距相等或不等都可以
D.组距成倍数增加
E.组距成倍数减少