投资者可根据市场间的差价进行套利，或在风险不变的情况下通过债券替换提高收益或提高凸性。（）
参考答案：对
解析：了解投资者选择。
Is this room ______ the meeting?[ ]
A. large enough to have
B. enough large to have
C. large enough having
D. enough large having
禁止使用（）浮筒乙炔发生器。乙炔发生器距离明火及焊接工作场所至少（）m，发生器附近严禁烟火，以免发生爆炸。
