成本效益比 meaning in English

cost to benefit ratio

( 1 ) the actual amount of water used to irrigate in the filtration irrigated area was reduced by 58 . 15 % to 81 . 63 % compared with the general irrigated area , and the ultilization ratio of the moisture content increases by 50 . 5 % to 81 . 7 %
综合考虑灌水量与产量的合理成本效益比和旱区的缺水问题，优先采用灌水量为133 . 33mm的渗灌。水分利用效率达到23 . 1kg mm ? hm ~ 2 ，实际灌水量比漫灌区下降了69 . 88 ，效果明显。
The expend of fuels is mainly rest with the factors of market , so , cutting the costs of run and maintenance becomes many power plant ' s chief target to decrease the cost of production . i . e . the improve of the equipment ' s reliability and the require of the cost of repair benefit retio
燃料支出主要取决于市场因素，所以，削减运行维护费用成为众多发电企业降低生产成本的首选目标，也就是对设备的可靠性、对检修成本效益比的要求提高，因此监测设备状态，在设备发生实质性故障之前进行检修的方式，即状态检修得到了广泛重视，它也是电力前沿技术之一。