A.提高產(chǎn)品質量B.縮短開發(fā)周期C.降低開發(fā)成本D.提升產(chǎn)品競爭力
A.0.4~0.5B.0.6~0.7C.0.7~0.9
A.70cmB.80cmC.85cmD.90cm