持续痰中带血最可能的疾病是 （）
A.支气管炎
B.肺炎
C.肺气肿
D.肺癌
E.心脏病
参考答案：D
若点（m，m-2）在第三象限，则m的取值范围是______．
The nurse is teaching the mother of a neonate. The nurse should instruct the mother to introduce her infant to solid foods at what age
A．2 months.
B．4 months.
C．6 months.
D．8 months.
