目前我国初级卫生保健的主要内容是()
A.健康教育和健康促进
B.预防疾病和保健服务
C.治疗疾病
D.社区康复
E.以上均对
参考答案:E
During the scientific experiment, Mr. Chen carefully poured the water into the tube, with my classmates _______ beside to see what would happen.
A.were standing
B.stood
C.standing
D.to stand
城域网的作用范围比广域网小。