人口自然增长率
参考答案：
是一定时期内（通常是一年内）净增人口数与年初的人口总数之比。
—Is there ______ wrong with your watch?
—Yes. It doesn't work well. That's why I was late today.[ ]
A. something
B. nothing
C. anything
D. everything
以下各药中，既可补脾气，益脾阴，又可补肺气，益肺阴的是
A．人参B．党参C．黄芪D．白术E．山药
