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。 Father’s Day will come _____June 20th this year.[ ] Which of the following best explores American myth in the 20th century? _____ Which of the following best explores American dream in the 20th century? _____ 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. Preeclampsia occurs primarily innulliparas after the 20th gestational week and is a triad of ______ was not until the early 20th century _____ the importance of his ideas was realized. 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（） _______ in the early 20th century, the school keeps on inspiring children’s love of art. Obama , the first black president in American history , _______ presidency on January 20th ,2009. What’s _____most useful invention in the 20th century? —_____ computer, I think. I was born _____ July 20th, 1992. My birthday is coming soon. [ ] With the arrival of the 20th century, the United States became increasingly urbanized, particularly in the ____ _____ cities. As is announced in the newspaper, the 20th World Cup __________ in 2014 in Brazil between June and July.