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暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片总数: 2 张•内容版本: v4•公开卡包•更新时间: 8/1/2026
卡片预览 (2 张)
#1
正面 (问题)
List factors of water quality
背面 (解答)
Taste and odour Turbidity and colour Toxic substances and other pollutants Bacteria Hardness or material content PH ( acidic or basic ) Dissolved oxygen Solids including floating materials Dissolved solids
#2
正面 (问题)
How is water distributed on the earth
背面 (解答)
3% is fresh 0.0009% is in the atmosphere 97% is salt 26% is land 74% is water