A.n1+αn2+(1+α)n3=0 B.n1-αn2-(1+α)n3=0 C.n1+αn2-(1+α)n3=0 D.n1-αn2+(1+α)n3=0
A.普通式 B.三銷軸式 C.組合式 D.球籠式
A.通過一對(duì) B.通過二對(duì) C.通過三對(duì) D.不通過