耐火材料有哪些使用性能?
参考答案:
耐火度、荷重软化温度、抗渣性,耐急冷急热性、高温体积稳定性。
图中阴影部分表示有阳光分布的地区,回答1-2 小题。
1、此时北京时间最接近的是 [ ]
A.6点
B.12点
C.18点
D.24点
2、关于该日的叙述错误的是 [ ]
A.奥地利进入滑雪季节
B.巴西高原草木凋零
C.北印度洋海区洋流呈顺时针方向流动
D.长江口盐度处于一年中较小值
Totally _____ accident, the businessman got hold of a ten-pound fake banknote that was believed to ______ two hundred years ago.
A.by; have been issued
B.with; have come into use
C.in; have come out
D.at; have come into being