A:熔点:戊烷>2,2一二甲基戊烷
B:密度:CCl4>>H2O
C:含氢量:乙炔>苯
D:同物质的量物质燃烧耗O2量:乙烷>苯
如图,⊙O是△ABC的外接圆,∠A=50°,则∠BOC的度数为( )
The boy looks ________, so he has few friends.