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【单选题】
A Windows Communication Foundation (WCF) service has a callback contract. You are developing a client application that will call this service.You must ensure that the client application can interact with the WCF service. What should you do?（）A.
On the OperationContractAttribute, set the AsyncPattern property value to true.
B.
On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the client.
C.
On the client, create a proxy derived from DuplexClientBase .
D.
On the client, use GetCallbackChannel .
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【单选题】52航班的意外 一个初春的晚上7点40分，52航班正飞行在离目的地A市不远处的高空。机上的油量还可维持近两个小时的航程。在正常情况下，像52这样的航班，由此飞行到降落K机场，仅需不到半小时的时间。可以说，飞机的这一缓冲保护措施是安全的。但没有想到，52航班在降落前遭遇了一系列耽搁和问题。 首先，晚上8：00整，K机场航空交通管理员通知52航班飞行员，由于机场出现了严重的交通问题，他们必须在机场上空...
A.
飞机燃料储备不足以及飞行员在计算剩余油量方面疏忽大意
B.
机场交通管理员在工作中的玩忽职守、推卸责任
C.
飞机燃料危急的信息没有被清晰地传递又未被充分地接受，因而造成飞机失事的真正原因是信息沟通过程中的障碍
D.
52航班飞行员在信息沟通过程中的用语不当问题
【单选题】Which of the following is false about quantity discounts?
A.
Quantity discounts are a form of price discrimination which allow a seller to charge a higher price for the first unit than for later units.
B.
Quantity discounts allow price discriminating producers to extract additional consumer surplus from customers.
C.
Price discrimination, such as offering quantity discounts, can result in a greater output, and thus greater consumer surplus and producer surplus, by a monopolist than if price discrimination was not possible.
D.
Quantity discounts benefit those customers who would not buy any of a monopolist's product at the price that the monopolist would charge if it could not price discriminate.
【单选题】To get people buying, many stores are running their usual sales offering discounts(打折)as high as 50 percent, hoping that shoppers don't repeat past habits by waiting for post-Christmas .
A.
bargains
B.
fancies
C.
decorations
D.
expectations
【简答题】人体最大的解毒器官是（ ）。
【简答题】目前,我国常见的国产轿车均采用( )。
【简答题】介副词填空 After the earthquake, many stores have been reaching ______ the poor by offering food and clothing at big discounts.
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