A.5%B.8%C.10%D.15%
A.星型拓?fù)浣Y(jié)構(gòu)B.環(huán)形拓?fù)浣Y(jié)構(gòu)C.樹形拓?fù)浣Y(jié)構(gòu)D.總線形拓?fù)浣Y(jié)構(gòu)
A.40 B.41 C.42 D.43