工程师考级的英语是什么水平，很难吗? 【分享】伊索寓言:兄和妹 the brother and the sister a father had one son and one daughter, the former remarkable for his good looks, the latter for her extraordinary ugliness. while they were playing one day as children, they happened by chance to look together into a mirror that was placed on their mother's chair. the boy congratulated himself on his good looks; the girl grew angry, and could not bear the self-praises of her brother, interpreting all he said (and how could she do otherwise?) into reflection on herself. she ran off to her father. to be avenged on her brother, and spitefully accused him of having, as a boy, made use of that which belonged only to girls. the father embraced them both, and bestowing his kisses and affection impartially on each, said, "i wish you both would look into the mirror every day: you, my son, that you may not spoil your beauty by evil conduct; and you, my daughter, that you may make up for your lack of beauty by your virtues." 兄和妹 父亲有一个儿子和一个女儿，儿子以他的美貌而闻名，而女儿却以奇丑出名。有一天，兄妹俩偶然在镜子里看见了自己的面目。哥哥自夸他的美貌，妹妹十分生气，难以忍受哥哥的自我讚扬，她似乎觉得哥哥的自夸是在嘲笑自己。为了报复哥哥，她便跪倒在父亲跟前，抱怨说哥哥是男孩子，却要了应属於女孩子的美貌。父亲连忙拥抱住兄妹俩，给他们每人亲吻和抚爱，并说：「我愿你们俩每天都去照照镜子。我的儿子，你不可让恶行来污损你的美貌；我的女儿，你可以用你的美德来弥补美貌的不足。」 这故事是说外表的美貌和内心的美德合而为一，才能使人真正的美丽。查看更多
请问，间歇精馏和连续精馏有什么差别，间歇精馏用在什么 ...？ 看看下面这段话的介绍吧！ processing mode refers to the way in which feed and product are introduced and withdrawn from the process. distillation occurs in two modes, continuous distillation and batch distillation . continuous distillation is feed is sent to the still all the time and product is drawn out at the same time. the idea in continuous distillation is that the amount going into the still and the amount leaving the still should always equal each other at any given point in time. batch distillation is when the amount going into the still and the amount going out of the still is not supposed to be the same all the time. the easiest example to use is like old fashioned spirit making. the distiller fills a container at the start, then heats it, as time goes by the vapors are condensed to make the alcoholic drink. when the proper quantity of overhead (drink) is made, the distiller stops the still and empties it out ready for a new batch. this is only a simple case, in industrial usage what goes on gets very complex. both continuous and batch distillation are very important to industry. continuous distillation is most often used with big volume products like jet fuel, benzene, plastic monomers. batch distillation is most often used with smaller volume products and in plants that make lots of different things and use the same still for many products (in different batches). 查看更多
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