Claire knew that Gladys thought she was having an .
A:affair
B:assistant
C:aspect
D:attraction
如图,AB为⊙O的直径,P为AB延长线上一点,PT切⊙O于T,若PT=6,PB=2,则⊙O的直径为( )
如图中①、②、③、④代表我国四条地理界线.读图回答问题.
如图所示的现象中,属于汽化的是( )