A.當(dāng)量摩擦系數(shù)越小,自鎖性能越好B.當(dāng)量摩擦系數(shù)越小,自鎖性能越差C.當(dāng)量摩擦系數(shù)越大,自鎖性能越好D.當(dāng)量摩擦系數(shù)越大,自鎖性能越差
A.55° B.95° C.2° D.48°