如何提高氩气产量?
参考答案:
①调节空分冷量平衡,增加粗氩系统冷量。
②调节主塔工况,增加氩馏分的取出量。
③调节粗氩塔工况,增加粗氩量。
④调节精氩塔工况,提高氩产量。
The dance performed by the disabled actors is really a hit, but years ago no one ____ they were to achieve such great success.
A.must have imagined
B.could have imagined
C.should have imagined
D.would have imagined
如图所示,在两个相同的烧杯中分别盛有质量、初温都相等的水和牛奶,用两个相同酒精灯对
其加热。
(1)加热过程中,发现要使它们上升相同的温度,需给水加热的时间要长一些,这是因为_______________。
(2)停止加热后,在相同时间内,盛有___的烧杯(填“水”或“牛奶”)温度下降得快些。若要使其
温度下降不至太快,请说出一种方法:______________。