A.直插,上端粗,下端細(xì)B.直插離開底部C.倒插,上端細(xì),下端粗D.斜插,上端細(xì),下端粗
A.1/3B.1/2C.2/3D.5/6
A.1~2℃B.2~3℃C.3~4℃D.4-5℃