随着环境污染以及能源可持续利用问题的日益严重,新能源汽车已经逐渐登上历史舞台,以锂电池为动力的新能源汽车续航能力有限,且使用寿命无法达到内燃机的水平.以燃料电池为动力的新能源汽车由于其长续航,"零排放"的优点成为新能源汽车发展的新趋势,并且具有广阔的前景,但燃料电池目前还存在低温条件下效率较低,启动困难等问...
Israel faces a situation of a limited amount of water supply and increasing demands. Since agriculture uses a large fraction of the water available in this country, one potential policy is to reduce allocations of water to agriculture in order to permit the growth of use in other sectors. Esti...