600MW机组空冷风扇为（）+（）布置。
参考答案：顺流；逆流
化学无处不在，下列与化学有关的说法正确的是( )
A．液氨汽化时能吸收大量的热，故可用作制冷剂
B．SO2能漂白纸浆等，故可广泛用于食品的漂白
C．味精的主要成分是蛋白质，烧菜时可加入适量
D．氢氟酸可用于雕刻玻璃制品，这是利用酸的通性
During the four years that Mrs. Lopez owned her car, she found that her total car expenses were $18,000. Fuel and maintenance costs accounted for of the total and depreciation accounted for of the remainder. The cost of insurance was 3 times the cost of financing, and together these two costs accounted for of the total. If the only other expenses were taxes and license fees, then the cost of financing was how much more or less than the cost of taxes and license fees ？
of the total and depreciation accounted for 
of the remainder. The cost of insurance was 3 times the cost of financing, and together these two costs accounted for 
of the total. If the only other expenses were taxes and license fees, then the cost of financing was how much more or less than the cost of taxes and license fees ？