钢筋集中加工配送体制有什么优点？
参考答案：节省原材节省工时，节省施工场地，减轻施工压力。
—Students should be allowed to wear their own clothes, I think.
—________.Thcy would concentrate more on their clothes than on their studies. [ ]
A. I hope so
B. I agree it
C. I disagree
D. I'm afraid so
当煤炭有多种用途时，作为最终产品可以列入GDP核算的是（）
A．家庭用于做饭与取暖
B．餐馆用于做饭
C．供热公司用于供应暖气
D．化工厂作为原料
