1岁小儿咳嗽3天,发热1天,两肺呼吸音粗糙,可闻及少许粗中湿啰音,最可能的诊断是()
A.上呼吸道感染
B.支气管炎
C.支气管肺炎
D.支气管哮喘
E.毛细支气管炎
参考答案:B
一质点绕半径为R的圆周运动了一周,其位移大小是 ,路程是 ,此运动过程中最大位移是 .
I saw a snake lying across the road ______. [ ]
A. on the way to home
B. on the way home
C. in the way to home
D. in the way home