A:+1
B:+2
C:+3
D:+4
戊戌变法、辛亥革命共同点不包括( )
A/An ______ is a formal decision about future action made by two people, groups, etc.
如图所示为一束光从空气斜射到某液面上,与液面的夹角为30°,且反射光与折射光相互垂直,则反射角是 ____,折射角是 ____