耗煤量＞20t／h的锅炉通常使用( )进行炉前燃料输送。

燃料化学的主要任务是：对入厂燃料进行（），对电厂经济效益进行（），对炉前煤进行品质（）等。 Which of the following best explores American dream in the 20th century? _____ Which of the following best explores American myth in the 20th century? _____ Father’s Day will come _____June 20th this year.[ ] When was the first case of AIDS in the world discovered in the 20th Century（） Which of the following best explores American myth in the 20th century? 环境监察部门在审核排污单位燃煤消耗量的同时，应了解排污者的生产情况，利用（）对排污者的耗煤量进行推算，也可以根据工业锅炉或者炉窑（）来推算耗煤量，以确认排污者所报的耗煤量是否准确。 Do you know___________ in Ya’an? — On the 20th of April，2013. ______ was not until the early 20th century _____ the importance of his ideas was realized. Preeclampsia occurs primarily innulliparas after the 20th gestational week and is a triad of Mother has ____ to give her a watch on her 20th birthday.（　　） 从煤的分析基准来看，电厂锅炉炉前用的煤是煤的（）基准 循环流化床锅炉的给煤方式按给煤位置来分有炉前给煤、__给煤及炉前炉后给煤三种 循环流化床锅炉的给煤方式按给煤位置来分，通常有给煤、炉后给煤及炉前炉后给煤三种方式（） What’s _____most useful invention in the 20th century? —_____ computer, I think. I was born _____ July 20th, 1992. My birthday is coming soon. [ ] Obama , the first black president in American history , _______ presidency on January 20th ,2009. As is announced in the newspaper, the 20th World Cup __________ in 2014 in Brazil between June and July. _______ in the early 20th century, the school keeps on inspiring children’s love of art. With the arrival of the 20th century, the United States became increasingly urbanized, particularly in the ____ _____ cities.