零息债券的修正久期（）其剩余到期时间。 [" 不确定"," 小于"," 等于"," 大于"]
1850 TSS－320设备级冗余保护包括（） ["电源板冗余","控制板卡冗余","风扇单元冗余","矩阵板卡冗余"]
Which description is correct for a private VLAN community port with respect to Layer 2 communications？（） [" It communicates with all other community ports in the private VLAN domain."," It communicates with only isolated ports in the private VLAN domain."," It communicates only with other community ports in the same community and associated promiscuous ports."," It communicates only with associated promiscuous and isolated ports."]
混合气过稀现象有哪些？
现实中教育管理模式类型可以概括为（） ["经验型","行政型","科学型","研究型"]
奴儿干都司
