When a kettle with a mass of 0.3KG is filled with water, the total mass is 0.8kg, and when it is filled with another liquid, the total mass is 0.7kg, then the density of this liquid is () A. 1.4×103kg/m3B. 0.875×103 kg/m3C. 0.8 kg/m3D. 0.8×103 kg/m3

When a kettle with a mass of 0.3KG is filled with water, the total mass is 0.8kg, and when it is filled with another liquid, the total mass is 0.7kg, then the density of this liquid is () A. 1.4×103kg/m3B. 0.875×103 kg/m3C. 0.8 kg/m3D. 0.8×103 kg/m3

Water mass: m water = 0.8kg-0.3kg = 0.5kg, V water = m water, ρ water = 0.5kg, 1.0 × 103kg / m3 = 0.5 × 10-3m3, kettle volume: v = V water = 0.5 × 10-3m3; liquid mass: m liquid = 0.7g-0.3kg = 0.4KG, V liquid = v = 0.5 × 10-3m3, |ρ liquid = m liquid, V liquid = 0.4KG, 0.5 × 10 − 3m3 = 0.8 × 103kg / m3