题目

21st century is _______ a newspaper; it helps us know a lot about the world. A . more than B . no more than C . not more than D . no less than 答案：A下列关于燃料充分燃烧的说法，不正确的是A．通人适量的空气                        B．固体燃料燃烧前要粉碎C．液体燃料燃烧时可以以雾状喷出           D． 化石燃料在任何条件下都能充分燃烧