新建煤气发生炉，炉内砌砖含有较多水分，点炉开工前必须按制订的严格升温计划进行烘炉。否则，砌砖因温度急变而产生裂缝、断裂而影响正常生产。
参考答案：对
— Do you know Henry didn't win that speech contest?
— _____? I thought he would. He worked so hard on it. [ ]
A. Do I
B. Don't I
C. Did he
D. Didn't he
老年人排尿困难最常见的病因是()
A．良性前列腺增生
B．神经性膀胱
C．膀胱结石
D． * * 狭窄
E．排尿无力
