下列物质见光不会分解的是( )
A:HClO
B:NH4Cl
C:HNO3
D:AgNO3
已知P是△ABC所在平面内一点,PB→+PC→+2PA→=0→,现将一粒红豆随机撒在△ABC内,则红豆落在△PBC内的概率是( )
The children tried ____ (go) to school by themselves.