地下工程卷材防水层为一或二层，应选用高聚物改性沥青类或合成高分子防水卷材。( )
参考答案：对
— We expected you yesterday.
— I'm sorry, I ____ you to say that I couldn't be here until today. [ ]
A. must have called
B. would be calling
C. could have been calling
D. should have called
男，35岁。突发上腹刀割样剧痛2小时来诊。既往有十二指肠溃疡病史5年。查体：病人表情痛苦，腹式呼吸消失，腹肌紧张呈"板状腹"，全腹压痛并反跳痛，以右上腹最明显。听诊肠鸣音消失，首选检查是（）
A.立位X线腹部透视
B.腹部B超
C.腹部CT
D.急诊胃镜检查
E.诊断性腹腔灌洗
