当太阳直射点位于南回归线上时，北回归线的正午太阳高度是（ ） A．23°26′ B．43°08′
做机械运动的物体是:A、铁锅生锈 ; B、田里玉米长高;C、水蒸发; D、地球绕太阳公转.
Rt△ABC斜边BC平面α,顶点Aα,则△ABC的两条直角边在平面α内的射影与斜边所成的图形只能是( )A.一条线段或一个直角三角形 B.一条线段或一
材料一：南海海域及周边国家示意图。 材料二：2012年7月24日，海南省三沙市成立，下辖西沙、中沙和南沙群岛的岛礁及其海域。永兴岛是西沙群岛，
如图：AC=DF，AD=BE，BC=EF。求证：∠C=∠F。
. When I did well in the exams, my father usually looked at me and reminded me to keep modest. A. happy B. happily C . more happy D. happiness
New York Times-The already crazed competition for admission to the nation’s most famous universities and colleges became even more intense （激烈的） this year, with many recording the lowest a
He will come to ShangHai in a month. (就划线部分提问) ________ _________ will he come to ShangHai
展开式中有理项共有 项．
=
为整数，