第9题: [单项选择]内源性感染病原微生物主要来源于 A. 医护人员的手 B. 污染的血制品 C. 病人自身正常菌群 D. 病原携带者 E. 其他病人 参考答案:C
第10题: [单项选择]冷拉直径为20mm的钢筋,冷拉前钢筋长为10d,冷拉后钢筋长208mm,其冷拉率应为:() A. 3% B. 4% C. 5% D. 5.5% 参考答案:B 答案解析:冷拉率的概念是,冷拉后钢筋的总伸长值与钢筋原长的比用百分数表示。在本题中,钢筋原长为10d即为200mm,冷拉后长度为208mm,伸长值为208-200=8mm,与原长200mm的比用百分数表示为:8
第31题: [单项选择]Policeman: OK, buddy, your driving license. How fast were you going William: Well it was about 50 mph or less. I was driving very slowly. Policeman: 50 mph ______ All right. That'll be one hundred dollars. 参考答案:A 答案解析:[注释] 根据上下文判断警察在处理对方超速的问题。C,D与情景不符;另外,限速用speed limit,而不是controlled speed。故A正确。