A:①②③
B:③④
C:②④
D:①③
如图所示,凸透镜的应用事例中,所成像性质完全相同的有( )
—The scarves are all beautiful.I can't decide which one to choose.—Oh,look at this red one.I think it's______.
四大洋中跨经度最广和纬度最高的大洋是
某变阻器两端的电压为220伏,则通过变阻器的电流I(A)与它的电阻R(Ω)之间的函数关系的图象大致为( )