A.回訪保修 B.維修保養(yǎng) C.配合工藝設(shè)備試生產(chǎn) D.空調(diào)系統(tǒng)綜合效能測(cè)定
A.5% B.10% C.15% D.20%
A.10% B.12% C.15% D.20%