A.粘度≤80s,含砂量<2%,密度≤2.0g/cm3 B.粘度≤50s,含砂量<1%,密度≤1.7g/cm3 C.粘度≤60s,含砂量<3%,密度≤1.5g/cm3 D.粘度≤40s,含砂量<1%,密度≤1.4g/cm3
A.300mm B.550mm C.780mm D.1000mm
A.1個(gè) B.2個(gè) C.3個(gè) D.4個(gè)