管样呼吸音见于下列哪项病变
A．支气管哮喘发作时B．肺水肿C．肺气肿D．肺炎实变时E．胸腔积液
参考答案：D
病因学研究的内容是（）
A.疾病转归的规律
B.疾病的基本机制
C.因果交替规律
D.疾病发生的原因与条件
E.机体损伤与抗损伤的斗争
Paul isn't as _______ as Sandy. He often makes mistakes in his homework. [ ]
A. careless
B. more careful
C. more careless
D. careful
