单项选择题
A.3/16;3/8 B.1/8;3/8 C.3/16;1/4 D.1/8;1/4
A.3/8 B.1/2 C.9/16 D.5/8
A.内线1 B.内线1-1/2 C.外线1 1/2 D.外线1