采用特殊生产工艺得到的多孔炭,表面积可达300-2,000平方米/克。
The use of special manufacturing techniques results in highly porous charcoals that have surface areas of 300-2,000 square metres per gram.
采用特殊生产工艺得到的多孔炭,表面积可达300-2,000平方米/克。
The use of special manufacturing techniques results in highly porous charcoals that have surface areas of 300-2, 000 square metres per gram.
世界上第一台电脑——近30吨埃涅阿克(1947年),使用了18000个电子管,另加1500个继电器以及其它器件,其总体积约90立方米,重达30吨,占地170平方米,需要用一间30多米长的大房间才能存放,是个地地道道的庞然大物。
The first general-purpose computer, the nearly 30-ton ENIAC (1947), contains 18,000 vacuum tubes, 70,000 resistors and 10,000 capacitors.
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