下列对应法则不是函数是()
A.http://nos.netease.com/edu-image/D5A22475BD50D9C70FDCAEF256A82295.png?imageView&thumbnail=520x520&quality=100
B.http://nos.netease.com/edu-image/026DB4D423179689255463A051506504.png?imageView&thumbnail=520x520&quality=100
C.http://nos.netease.com/edu-image/4013DCA5DA43E610D745F981827E8CFB.png?imageView&thumbnail=520x520&quality=100
D.http://nos.netease.com/edu-image/2EF566D6C31E103D0D232AE62944CE9C.png?imageView&thumbnail=520x520&quality=100