半自然水域
Semi-nature aqueous reserve
产量自然递减
natural production decline
黑龙江凉水自然保护区
Liangshui Nature Reserve in Heilongjiang
凉水自然保护区
liangshui nature reserve
Liangshui national nature reserve
Liangshui natural preserve
数字式自动测量水量计
digital automatic-surveying water meter
污水自然净化法
sewage self-purification system
杨东山十二度水自然保护区
yangdongshan shierdushui nature reserve
蒸发处理自然水面蒸发量
Natural water surface evaporation rate
自然水分亏缺率
natural moisture deficiency rates