发生高碳酸血症的病因,不正确的是().
A.气管阻塞狭窄
B.局部肺间质纤维化
C.严重肺结核
D.昏迷合并肺部重症感染
E.慢性阻塞性肺疾病
参考答案:B
龙门铣床的组别代号是()。
It is said that a new policy is being put( )practice in your foreign trade.
A.on
B.into
C.under
D.with