电力工程施工综合进度的关键节点，包括（）
A.锅炉钢架吊装
B.循环水管安装
C.汽机扣盖
D.输煤安装
E.点火吹管
参考答案：A, C, E
What the remote areas need ____ education to children and what the children need ____ good textbooks at the moment.
A．is; are
B．are; is
C．was; were
D．were; was
跳汰机的工作原理是什么？
