如图,AB为⊙O的弦,OA=4,∠AOB=120°,则AB的长为( )
A:4
B:23
C:2
D:43
—— I'm going to Hangzhou for a holiday this weekend.—— ___ you are there, could you buy me some green tea?
关于误差,下列说法错误的是
实数a在数轴上的位置如图所示,则下列说法正确的是( )