问题 单项选择题

程序化交易模型评价的第一步是()。

A.程序化交易完备性检验

B.程序化绩效评估指标

C.最大资产回撤比率计算

D.交易胜率预估

答案

参考答案:A

解析:程序化交易模型的完备性检验是模型评价的第一步,主要通过对回测结果当中的成交记录进行研究,观察开仓与平仓的价位与时问点是否和模型所设定的结果一致,并且应当特别注意在一些特殊的交易时间段,比如开盘与收盘的时刻,策略是否有效。

单项选择题
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The view over a valley of a tiny village with thatched (草盖的) roof cottages around a church, a drive through a narrow village street lined with thatched cottages painted pink or white, the sight over the rolling hills of a pretty collection of thatched farm buildings―these are still common sights in parts of England. Most people will agree that the thatched roof is an essential part of the attraction of the English countryside.

Thatching is in fact the oldest of all the building crafts(工艺)practised in the British Isles. Although thatch has always been used for cottage and farm buildings, it was once used for castles and churches, too.  

Thatching is a solitary(独自的)craft, which often runs in families. The craft of thatching as it is practised toady has changed very little since the Middle Ages. Over 800 full-time thatchers are employed in England and Wales today, keeping and renewing the old roofs as well as thatching newer houses. Many property owners choose thatch not only for its beauty but because they know it will keep them cool in summer and warm in winter.

In fact, if we look at developing countries, over half the world lives under thatch, but they all do it in different ways. People in developing countries are often unwilling to go back to traditional materials and would prefer modern buildings. However, they may lack the money to allow them to get the necessary materials. Their temporary mud huts with thatched roofs of wild grasses often only last six months. Thatch which has been done the British way lasts from twenty to sixty years, and is an effective defiance against the heat.

小题1:Which of the following remains a special feature of the English countryside?

A.Narrow streets lined with pink or white houses.

B.Rolling hills with pretty farm buildings.

C.Cottages with thatched roofs.

D.Churches with cottages around them.小题2:What do we know about thatching as a craft?

A.It is a collective activity.

B.It is practised on farms all over England.

C.It is quite different from what it used to be.

D.It is in most cases handed down among family members.小题3:Thatched houses are still preferred because of _________.

A.their style and comfort

B.their durability

C.their easy maintenance

D.their cheap and ready-made materials小题4:People in developing countries also live under thatch because ________.

A.thatched cottages are a big tourist attraction

B.thatched roof houses are the cheapest

C.thatch is an effective defense against the heat

D.they like thatched houses better than other buildings