锅炉检修常见的下料种类有哪些?
参考答案:
正凌锥体下料,天圆地方下料、虾米腰下料、煤粉分配器下料等。
—— My mother does a lot of housework before going to work,but she has never been late.
—— _____.
A.So does my mother
B.Neither does my mother
C.Nor has my mother
D.So it is with my mother
近代中国进步文学、艺术家的神圣使命是
①发展本国经济
②救亡图存
③弘扬科学精神,批判封建愚昧
④讴歌光明、鞭挞黑暗 [ ]
A.①②
B.②③
C.③④
D.①④