【单选题】世界旅游组织在1991年6月召开的旅游统计大会上所提出的新概念是()
【简答题】A.After Henry James referred highly to her. B.After seven of her poems were published. C.After her poems became known to others. D.After she was dead for many years.
【单选题】“当日游客”的概念是 在 召开的旅游统计国际大会上提出的。 ( )
【单选题】“当日游客”的概念是世界旅游组织于1991年6月在 召开的旅游统计国际大会上提出的。( )
【简答题】如图,在直角坐标系中,点B坐标为(-4,0),点C与点B关于原点O对称,点A为y轴上一动点,其坐标为(0,k),BE,CD分别为△ABC中AC,AB边上的高,垂足分别为E,D. (1)当k=-3时,求AB的长; (2)试说明△DOE是等腰三角形; (3)k取何值时,△DOE是等边三角形?(直接写出k的值即可)
【简答题】A.After Henry James referred highly to her. B.After seven of her poems were published. C.After her poems became known to others. D.After she had been dead for many years.
【简答题】如图,每个小方格都是边长为1的正方形,以O点为坐标原点建立平面直角坐标系. (1)画出△ABC关于原点对称的△A 1 B 1 C 1 ; (2)画出△A 1 B 1 C 1 向上平移4个单位后得到的△A 2 B 2 C 2 ; (3)△A 2 B 2 C 2 能否由△ABC绕平面内某一点旋转得到,若能,标出旋转中心P的位置,并写出其坐标;若不能,请简要说明理由.
【判断题】Among Dickinson’s 1775 poems, only a few were published after she died.
【单选题】如果希望减小放大电路向信号源索取的电流,则宜采用 负反馈。
【简答题】如图,在正方形网格中建立平面直角坐标系,格点O为原点,格点A的坐标为(-1,3). (1)画出点A关于y轴对称的格点B,并写出点B的坐标(______,______); (2)将线段OA绕着原点O顺时针旋转90°,点A落在格点C处,画出线段OA扫过的平面区域(用阴影表示),则AC的长为______; (3)过点C作AC的切线CD,D为格点,设直线CD的解析式为y=kx+b,y随x的增大而_____...