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【多选题】
下列属于债券定价原理的是A.
随着债券到期时间的临近，债券价格的波动幅度减少，并且是以递增的速度减少；反之，到期时间越长，债券价格波动幅度增加，并且是以递减的速度增加
B.
对于给定的收益率变动幅度，债券的息票率与债券价格的波动幅度之间成反比关系。换言之，息票率越高，债券价格的波动幅度越小
C.
债券的价格与债券的收益率成正比例关系
D.
当债券的收益率不变，即债券的息票率与收益率之间的差额固定不变时，债券的到期时间与债券价格的波动幅度之间成反比关系
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【单选题】Whether you liked it or not, you shouldn't have ___ to your mother when she was talking to you. [ ]
A.
turned back
B.
turned down your back
C.
turned your back
D.
turned your back away
【单选题】某消防检测机构对一栋二类高层办公楼的消防给水系统进行检测。该建筑室外有两路消防进水，自动喷水灭火系统设计流量为27L/s，设计扬程为1.0MPa；室内消火栓系统设计流量为20L/s，设计扬程0.98MPa；高位消防水箱最低有效水位距最高层喷头的有效距离为10m。查验验收报告，系统所有检测合格。检测消防泵性能及其运转情况，下列检测结果中，符合现行国家消防技术标准的是（）。
A.
自动喷水泵零流量时的压力为1.5MPa
B.
消火栓泵出流量25L/s时电机停止工作
C.
自动喷水灭火系统最不利点末端试水装置打开5s后，流量开关发现信号启动自动喷水泵
D.
室内消火栓系统试验消火栓出流量为3L/s时，消火栓泵没有启动
【单选题】听力原文：M: Have you heard whether George will have to have that operation or not? W: That's why I called you. When I visited the hospital this noon, I learned they had operated around 9 o'clock. The doct...
A.
He is going to be operated on at 9 o'clock.
B.
He is under operation now.
C.
He already had his operation.
D.
He is all right now.
【单选题】对某高层公共建筑消防给水系统进行维护检测，消防水泵出水干管上的压力开关动作后，消防水泵未启动。下列故障原因分析中，可排除的是( )。
A.
压力开关与水泵之间线路故障
B.
消防水泵控制柜处于手动启泵状态
C.
消防水泵控制柜内继电器损坏
D.
消防联动控制器处于手动启泵状态
【单选题】听力原文：M: Have you heard whether George will have to have that operation or not? W: That's why I called to you. When I visited the hospital this noon, I learned they had operated around 9 o'clock. The d...
A.
He is going to be operated on at 9 o'clock.
B.
He is under operation now.
C.
He already had his operation.
D.
He is all right now.
【简答题】下列函数由哪些函数复合而成.(1) (2) (3) (4) .
【简答题】Whether you have a large network or a small one, you know that the price of the com puter is often only a small part of your total cost of using a computer. Administration and maintenance can drive up...
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