-0.5的倒数是______，3-π的绝对值是______．

人口老龄化按以下的哪项指标来确定（）

A.老年人人口总数占全体人口总数中百分数

B.老年人的总数

C.预期寿命

D.老年人与非老年人口的比

E.人口的平均年龄

Mr. Vice Premier, the Finance Minister,
Mr. Mayor, Ladies and Gentlemen,
Let me, first of all, return the compliment, on behalf of all of us, to you, Mr. Vice Premier, to you, Mr.Minister, and you, Mr. Mayor, for the great contribution that you have made to the success of this meeting. Idon’t think any of us could have imagined a more well-organized conference or a more warm welcome thanyou have given us here in Shanghai, and I would like everyone to join me in expressing our thanks to you.[TONE]∥[TONE]
I would like to make just two general comments.
The first is that all of us have to work politically to ensure that poverty and the alleviation of poverty arecentral on the global agenda. I believe that today it is not central on the global agenda. I believe that todaylip service is given to the question of poverty. The real issues today that seem to be on the mind of theworld—terrorism, Iraq, Afghanistan, the budget deficits—are the visible problems that must be dealt with,that are immediate, while attention is given less to the equally inevitable and the equally dangerous problemsthat come with poverty. [TONE]∥[TONE]
We must deal with the question of social equity and social justice. Because without dealing with thatquestion of poverty, there can’t be any peace, and $900 billion being spent on military expenditure, $300billion being spent on agricultural subsidies, and $50- or $60 billion being spent on overseas developmentassistance is one of the absurdities that we have to change. [TONE]∥[TONE]
And the second and last thing I’d like to say is that we have talked about economics, we have talkedabout advances that must be made for social justice, and we’ve talked about steps that need to be taken inempowerment and in the methodologies that we can use to scale up. [TONE]∥[TONE]
But the one thing that we have not talked about and that I think all of us need to recognize is that if weare to be effective in advocating the case for poverty reduction, and hopefully eradication, is that we have to do it with a sense of belief that what we are doing is right. We should be addressing the question of poverty not just from economics, but because dealing with equity and social justice is right. [TONE]∥[TONE]
We should not be afraid to say that there is a human content in what we’re doing, but there is alsoa moral and, if you like, spiritual content in what we’re doing. We are not here just as economists. Weare here because we owe every human being in the world an opportunity and a chance to fulfill theirdestiny. [TONE]∥[TONE]
And so going out from this meeting I hope we feel a little bit uplifted and a little bit responsible to goout from here to deal with the question of scaling up of poverty alleviation because it’s right, and as membersof the human race, it’s something that we should do.
Thank you very much to our hosts, and thank you all for being here. [TONE]∥[TONE]

某建筑物现浇楼梯，底层为单跑，踏步长2m，宽0.3m，高0.15m，共24步，休息平台长5.13m，宽2.30m，二层为双跑，每步长1.56m，宽0.3m，高0.15m，共14×2步，休息平台长5.13m，宽1.73m，做普通水磨石面层，试求该楼梯混凝土工程量及直接费。

某工程项目施工合同价为560万元，合同工期为6个月，施工合同规定如下：
1．开工前业主向施工单位支付合同价20%的预付款。
2．业主自第一个月起，从施工单位的应得工程款中按10%的比例扣留保留金，保留金限额暂定为合同价的5%，保留金到第三个月底全部扣完。
3．预付款在最后两个月扣除，每月扣50%。
4．工程进度款按月结算，不考虑调价。
5．业主供料价款在发生当月的工程款中扣回。
6．若施工单位每月实际完成的产值不足计划产值的90%时，业主可按实际完成产值的8%的扣留工程进度款，在工程竣工结算时将扣留的工程进度款退还给施工单位。
7．经业主签认的施工进度计划和实际完成产值见下表。

施工过度计划和实际完成产值 月份 1 2 3 4 5 6 计划完成产值/万元 70 90 110 1lO 100 80 实际完成产值/万元 70 80 120 业主供料价款/万元 8 12 15

该工程施工进入第四个月时，由于业主资金出现困难，合同被迫终止。为此，施工单位提出以下费用赔偿要求：①施工现场存有为本工程购买的特殊工程材料，计50万元；②因设备撤回基地发生的费用10万元；③人员遣返费用8万元。
[问题]
1.该工程的工程预付款是多少万元应扣留的保留金为多少万元

在名义年利率相同的情况下，复利频率不同，有效年利率也不同。随着复利次数的增加，有效年利率也会不断增加，但增加的速度会越来越慢。 ( )