阐述了火山灰活性、烧失量、细度和需水量比等品质指标对粉煤灰质量的影响，对粉煤灰品质提出了要求。
Effects of quality index, which are volcanic ash activity, loss on ignition, fineness and water demand ratio, on quality of fly ash are expatiated, the requests to quality of fly ash are put forward.
花园里的植物需水量极小，却能保持屋顶比黑瓦房顶阴凉，同时吸收大量的二氧化碳。
It is made of plants that require minimal watering, keep the roof cooler than black roof tiles and absorb lots of carbon dioxide.
单作物系数法比双作物系数法简单，建议在进行生育期作物需水量计算时采用单作物系数法；
Single crop coefficient approach is simpler than dual crop coefficient approach. It is suggested to using single crop coefficient approach for calculating crop water requirements of growth stages.
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