A:气压与气温呈负相关,当白天气温最高时,也是该日气压最低时
B:气压的日变化随纬度升高而减少,年变化随纬度升高而增大
C:海洋上的气压年变化比同纬度大陆要大
D:气压日变化的振幅,陆地要小于海洋
2015年1月,科学家在南极洲发现一个陨石凹坑,形状如圆形平底锅,如图所示.小明在圆心A点大喊一声,经过6s听到回声.设空气中声速为340m/s,圆形凹坑的直径为( )
also,piano,teach,club,speak
Mrs Smith is my teacher.At school she____us English.Her English is very good so we all like her.She has got two daughters,Gina and Helen.They are____at our school.So I know some things about them Gina____English very well.Helen is good at music.She plays the____very well.She is in the Music____.There,she and our music teacher Ms White help students with the piano.