房地产市场上的自然周期领先于投资周期的变化。( )
参考答案:错
—I had a really good weekend at my uncle's. —_______.
A.Oh, that's very nice of you
B.Congratulations
C.It's a pleasure
D.Oh, I'm glad to hear that
计算题:某座竖炉焙烧面积10m2,生产球团矿1200吨,生产期间停机检修2小时,问利用系数是多少?