在平面直角坐标系内,点O为坐标原点,A(﹣4,0),B(0,3).若在该坐标平面内有以点P(不与点A、B、O重合)为一个顶点的直角三角形与Rt△ABO全等,且这个以点P为顶点的直角三角形与Rt△ABO有一条公共边,则所有符合条件的三角形个数为( )
A:9
B:7
C:5
D:3
Food is very important to our health. Everyone needs to eat well if he or she wants to have a strong body.Our minds, like our bodies, always need the best food. This kind of food is knowledge. We start getting knowledge when we are very young.
第一次
第二次
甲种货车(辆)
2
5
乙种货车(辆)
3
6
累计运货(吨)
13
28
下列我国古代的技术应用中,其工作原理不涉及化学反应的是( )