钢结构外包层防火板材常用的有()
A.石膏板
B.铝板
C.水泥蛭石板
D.硅酸钙板
E.岩棉板
参考答案:A, C, D, E
下列房地产投资风险中,属于系统风险的是()。
A.变现风险
B.比较风险
C.资本价值风险
D.时间风险
While watching Titanic, most people couldn't help crying when it came to the scene________ Jack
saves the girl's life but dies in icy water himself.[ ]
A. which
B. as
C. why
D. where