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
