(1 )已知⊙O的半径为1,AB是⊙O的一条弦,且AB= 3 ,则弦AB所对圆周角的度数为60度;
(2 )已知⊙O的半径为5,圆心O到弦AB的距离为3,则⊙O上到弦AB所在直线的距离为2的点有3个;
(3 )平分弦的直径垂直于弦;
(4 )已知点P是线段AB的黄金分割点,若AB=1,AP= 5−12 .
A:1个
B:2个
C:3个
D:4个
在地球仪上,纬度的度数变化的规律是( )
1602年,荷兰成立具有部分国家职能的特许贸易公司——东印度公司,是世界上第一个可上市交易的股份公司,它成功地将社会分散的财富,变成了自己对外扩张集中的资本,然后通过与南洋的贸易换回当时欧洲没有的货物。荷兰东印度公司的成立( )
Kate's father took her to the hospital to see her one-day-old baby brother. They drove there straight from school. Kate had never been inside a hospital before. ①This was a new experience for her.
At the gate there was a large sign listing all the departments of the hospital, with arrows (箭头) showing how to find them. When Kate saw the A&E department(急救室), she asked,“What do those letters stand for?”“Accident and emergency,” replied her father,
②“Last spring, I took our sister there because she fell off her bike,”
【环境保护】阅读材料,完成下列问题。
2016年9月,一种橙色车轮,样式古怪的单车出现在北京街头和很多人的朋友圈。从上海开始创业的摩拜单车(mobike)终于来到了北京。使用摩拜单车智能手机应用,用户可以用自己的手机查看单车位置,继而预约并找到该车。通过扫描车身上的二维码开锁即可开始骑行。到达目的地后,在街边任意画白线区域内手动锁车完成归还手续。下图为摩拜单车示意图。
指出摩拜单车出现在北京的地理意义。