A.≥0.90 B.≥0.92 C.≥0.93 D.≥0.95
A、≥1.5t/m3 B、≥1.6t/m3 C、≥1.7t/m3 D、≥1.8t/m3
A.≥1.5t/m3 B.≥1.6t/m3 C.≥1.7t/m3 D.≥1.8t/m3