Our headmaster isn't in his office. I can't find him anywhere. Did you notice him ______ the office?
A:to enter
B:enter
C:to leave
D:leave
如图,在Rt△ABO中,∠ABO=90°,OB=4,AB=8,且反比例函数y=kx在第一象限内的图象分别交OA、AB于点C和点D,连结OD,若S△BOD=4,(1)求反比例函数解析式;(2)求C点坐标.
若m =2125,n =375,则m、n的大小关系正确的是( )
按照你在显微镜下观察到的植物叶表皮结构,在答题卡相应方框中画一个由2个保卫细胞围成的气孔,并标注保卫细胞和气孔.
单词拼写。
已知α为一锐角,化简:sinα-12+sinα=____ .