A.點(diǎn)M和點(diǎn)N B.點(diǎn)N和點(diǎn)E C.點(diǎn)E和點(diǎn)F D.點(diǎn)F和點(diǎn)M
A.M(15,20,25) B.M(25,15,20) C.M(20,15,25) D.M(25,20,15)
A.1:4 B.4:1 C.1:2 D.10:40