A、∮3*12m傾角2.8°φ3.6*12.6m傾角1.1° B、∮3*12m傾角5°φ3.6*12.6m傾角1.1° C、∮3*12m傾角2.8°φ3.6*12.6m傾角3°
A、黏度大 B、黏度小
A、∮400×9501316∮400×7501312 B、∮400×7501312∮400×9501316 C、∮400×7501316∮400×9501312