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符合以下条件之一时为不合格列车：发生责任铁路交通事故；发生责任铁路货车行车设备故障；（）；到达、始发作业的列车中有制动故障关门车；得分在700分以下。

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You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database which is named Sellings in the instance. The Sellings database contains a table named Productions. The table is used to stores information about all types of products. The Productions table is often queried by users on the basis of the RadioSize column. The RadioSize column contains the NULL value for all products other than Radios. Currently no index exists on the RadionSize column. According to the requirement of the company CIO, you have to optimize the query performance and reduce the effect on the disk space to the least. So what action should you perform to achieve this goal?（）

A. On the Products table, you should create a view.
B. On the RadioSize column, you should create a clustered index
C. On the RadioSize column, you should create a filtered index
D. On the RadioSize column, you should create a unique clustered index

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关于新甲型H1N1流感毒株的基因，正确的描述是（）。

A. 仅包含人流感病毒基因
B. 仅包含猪流感病毒基因
C. 仅包含禽流感病毒基因
D. 仅包含猪流感和禽流感病毒基因
E. 包含猪流感、禽流感和人流感三种流感病毒的基因片段

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甘露消毒丹中配伍连翘、射干、贝母、薄荷意在（）.

A. 清热解毒，散结消肿
B. 行气化湿，悦脾和中
C. 利湿化浊，清热解毒
D. 利水渗湿，清热解毒
E. 清热化湿，理气和中

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生铁分为炼钢生铁、铸造生铁和（）。

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