可引起Ⅰ型呼吸衰竭的是
A.急性间质性肺炎
B.结节病Ⅰ期
C.原发综合征
D.重症肌无力
E.纵隔淋巴瘤
参考答案：A
–Were you at school when he came to see you?
–Yes, I ______ a math class.
A. was having B. had C. am having
活性炭池的大小决定于（）
A.流量、水力负荷和接触时间
B.水温、浊度和接触时间
C.pH值、碱度和矿化度
D.浊度、pH值和接触时间
