A.質(zhì)量證明書(shū) B.材質(zhì)書(shū) C.產(chǎn)品合格證 D.進(jìn)場(chǎng)報(bào)告
A.2.5Mpa B.3.0MPa C.3.5MPa D.4.0MPa
A.15 B.20 C.12 D.10