Bread _____ grain. [ ]
A. is made of
B. are made of
C. is made from
D. are made from
答案:C
如果炼1吨钢,需要2吨铁矿石和1吨煤,图5-10中钢铁厂布局模式最合理的是(下图中■代表煤矿区,▲为铁矿区,●为消费市场)( )
图5-10
下列哪个措施不能消除导致火灾爆炸的物质条件?()
A.生产中尽量少用可燃物
B.使空气中可燃物浓度保持在安全限度以下
C.加强爆炸危险物的管理
D.采取必要的疏散措施