过火砖呈铁锈色，声极响亮，强度大。。
参考答案：对
The wise president ______ the whole nation after the war broke out. [ ]
A. held together
B. carried together
C. took together
D. brought together
轴箱与轴承使轮对的滚动转化为构架、车体沿钢轨的（）
A.侧动
B.滑动
C.平动
