The mathematical model of hydraulic regime of ring-shaped heat-supply network is established, and the pressure head checkformula for quota heating is given.
建立了环状管网水力工况的数学模型，给出限额供热的压头校核公式。
2
Companies using the milk for further production (e.g. of powdered infant formula) normally check the protein level through a test measuring nitrogen content.
而使用牛奶进行下一步加工(比如婴幼儿配方奶粉)的公司，一般通过测量含氮量来检测蛋白质含量。
3
Then your view selection formula need only check for that flag.