保护面积 meaning in Chinese

protection area

The helmets are not weighty and have more useful protective area while providing excellent durability and integrity . the vents with inner air channels draw the air through the helmet and over the brow for maximum cooling
我公司生产的系列头盔，独具欧美风格，用材考究，重量轻，有效保护面积大，通风散热性能好，佩戴安全舒适。
( 2 ) the demonstration of sustainable development of agriculture : from the angle of the safety of gram , that whether the needs of population can be satisfied by the production of the cultivated land area and the farmland protective area is demonstrated after jiangjin has been developed into a big city
( 2 )农业可持续发展方面的论证:站在粮食安全的高度，对全市的耕地保有量及基本农田保护面积对未来江津市发展成为大城市后的用粮保证率进行了分析论证。
2 ) a simplified sprinkler system which is composed of water source , pipeline pump , pipes , current of water display , nozzle , contral valve , is suitable for our country . and its water is supplied by gravity tank or gravity tank or hydrant system or city 3 ) spray intensity of simplified sprinkler system is 3 l / min . m2 , protection area of them is 50m2
3 )简易自动喷水灭火系统的喷水强度为3 / min . m2 、保护面积为50m2 、喷头的安装间距为3 . 7m等参数。 4 )简易自动喷水灭火系统最大设计动作喷头数为四只,供水时间宜为30min等。