水温对养殖鱼类的影响？

  Some students believe that whether they have much money or large possessions, they will be happy. They believe that they will be able to do anything they wanted to do if they have money. Some students think that they should be good health, and enjoy whatever they like. Many students wish to have much wealth from their parents. In this way, they don’t have to work hardly and they can own everything. I don’t quite agree on the above points. I don’t think money means happy. We cannot buy much things with money, such as health, happiness and knowledge. I value knowledge, it makes me happy, for I can do a lot of for mankind with knowledge. Although different people value happiness differently, me wealth of happiness is in my study.

按照税负能否转嫁分类，税收可分为（）。

A.中央税

B.地方税

C.中央地方共享税

D.直接税

E.间接税

下列哪项属相反配伍

A．丁香配郁金

B．人参配五灵脂

C．人参配藜芦

D．巴豆配牵牛子

E．硫黄配朴硝

_________________叫做功率，功率表示了____________________。

背景
某拦湖大坝加固改造工程发包人与施工单位签订了工程施工合同，合同中估算工程量为8000m³，单价为200元/m³，合同工期为6个月，有关付款条款如下：
(1)开工前发包人应向施工单位支付合同总价20%的工程预付款；
(2)发包人自第一个月起，从施工单位的工程款中，按5%的比例扣留保留金；
(3)当累计实际完成工程量不超过估算工程量10%时，单价不调整；超过10%时，对超过部分进行调价，调价系数为0.9；
(4)工程预付款从累计工程款达到合同总价的30%以上的下一个月起，至合同工期的第五个月(包括第5个月)平均扣除。
施工单位每月实际完成并经监理单位确认的工程量见下表。

合同总价为多少 工程预付款为多少 (计算结果以万元为单位，保留到小数点后两位，下同)