房地产投资的个别风险包括( )。
A．购买力风险
B．比较风险
C．收益现金流风险
D．或然损失风险
E．时间风险
参考答案：B,C,E
We writing a letter of complaint to the manager himself．But we'd like to hear your opinion first．
A．have been thinking of
B．had thought of
C．were thinking of
D．thought of
分馏法原油稳定装置加热炉冒黑烟与（）有关。
A.燃料气与空气配比不好
B.燃料气带烃
C.炉管烧穿
D.以上三者
