高炉长期休风（封炉），炉前操作过程中，休风最后一炉铁一定要大喷，最大程度排净渣铁。
参考答案：对
蕨类植物主要用作观叶，下列（）为一型叶。
A.铁线蕨、鸟巢蕨、贯众
B.圆盖荫石蕨、肾蕨
C.鹿角蕨、凤尾蕨
D.A和B
A: What shall I do I've got so many things on my mind now. Will anybody help me B:______
A．How can I get support from others
B．Don't expect me to help you. Is there anybody who can help me
C．Don't ask me. It's your baby, Mary. See, my hands are full.
D．Sorry, I didn't expect you are so busy.
