A.7% B.70% C.17% D.0.7%
A.磁盤 B.協(xié)議 C.數(shù)據(jù) D.軟件
A.不銹鋼 B.碳素結(jié)構(gòu)鋼 C.合金結(jié)構(gòu)鋼 D.特殊用途剛
A.7%
B.70%
C.17%
D.0.7%