A.產(chǎn)品合格證 B.質(zhì)量等級(jí)證 C.質(zhì)檢證 D.使用許可證
A.3~4h;5h B.4~6h;10h C.6~9h;15h D.7~10h;20h
A.0~0.2m/s B.0~0.3m/s C.0~0.4m/s D.0~0.5m/s