The mathematical model of hydraulic regime of ring-shaped heat-supply network is established, and the pressure head check formula 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。
Considering practical ring shaped heating furnace of a certain company, a threedimensional heat transfer mathematic model for tube rounds heating process was established.
针对某公司环形加热炉的实际生产情况，建立了管坯加热过程的三维传热数学模型。
The utility model discloses an assembled plastic base steel ring which comprises a ring-shaped base made up of plastics.
本实用新型公开了一种组合式塑料座钢领。
The utility model relates to a multifunctional flashlight type ring; a disc-shaped base is processed on the surface of the ring;
本实用新型涉及一种多功能手电式戒指，在指环表面加工有圆盘形底座；
The utility model relates to a multifunctional flashlight type ring; a disc-shaped base is processed on the surface of the ring;
本实用新型涉及一种多功能手电式戒指，在指环表面加工有圆盘形底座；
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