属于咀嚼粘膜的是
A．唇粘膜
B．颊粘膜
C．软腭粘膜
D．硬腭粘膜
E．口底粘膜
参考答案：D
下列最不符合Ⅲ度房室传导阻滞的是()
A.P与QRS无传导关系
B.心房率快于心室率
C.P与QRS无传导关系，房率快
D.心房率慢于心室率
E.P与QRS无传导关系，QRS慢并且畸形
—Do you __________ an American friend?
—No, I don’t. But my sister __________ one.
A．has, has
B．has, have
C．have, have
D．have, has
