一批零件600个,一个工人每小时做15个,用关系式表示人数x与完成任务所需的时间y之间的函数关系式为 ____ .
地球的自转
Student loan is supposed to provide financial support for people who would ______ not be able to go to college.
在Rt△ABC中,∠C=90°,∠BAC的角平分线AD交BC于点D,CD=2,则点D到AB的距离是 ( )