警铃

Our "ZheAn" branded products include indoor hydrants, post hydrants, fire pump connectors, dry powder fire extinguishers, CO2 fire extinguishers, fixed CO2 fire systems, HFC-227 ea fire extinguishing system, aqueous film fire extinguishers, foam extinguishers, steel and wooden fire-resistant doors and roller shutters, squirt guns, couplings, fire alarms, buttons, hoses, hose reels, hydrant boxes, spray headers, wet alarming systems, and so forth.

我厂生产的注册&浙安&牌消防产品系列有室内消火栓、地上式消火栓、消防水泵接合器、干粉、CO2、CO2 固定系统、七氟丙烷灭火系统、水成膜灭火器、泡沫灭火器、钢制和木质防火门防火卷帘、水枪、接扣、消防警铃、按钮、水带、消防软管卷盘、消防栓箱、灭火器箱、喷淋头及湿式报警系统产品。

Our "ZheAn" branded products include indoor hydrants, post hydrants, fire pump connectors, dry powder fire extinguishers, CO2fire extinguishers, fixed CO2fire systems, HFC-227 ea fire extinguishing system, aqueous film fire extinguishers, foam extinguishers, steel and wooden fire-resistant doors and roller shutters, squirt guns, couplings, fire alarms, buttons, hoses, hose reels, hydrant boxes, spray headers, wet alarming systems, and so forth.

我厂生产的注册&浙安&牌消防产品系列有室内消火栓、地上式消火栓、消防水泵接合器、干粉、CO2、CO2 固定系统、七氟丙烷灭火系统、水成膜灭火器、泡沫灭火器、钢制和木质防火门防火卷帘、水枪、接扣、消防警铃、按钮、水带、消防软管卷盘、消防栓箱、灭火器箱、喷淋头及湿式报警系统产品，产品均以品质优良、外观光洁、新颖、质量可靠和价格合理而赢得社会各界人士的认可和支持。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。