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请完成本次上机实训，将答案代码直接写在下面文本框中并提交！实训步骤：打开数据库软件，点击左上角的“新建查询”，建表stumark，至少包含writtenexam字段，插入相关记录，写while语句块运行查看结果。建表代码：CREATE TABLE [dbo].[stumark]([ExamNo] [char](7) COLLATE Chinese_PRC_CI_AS NOT NULL,[stuNo] [char](6) COLLATE Chinese_PRC_CI_AS NOT NULL,[writtenExam] [int] NOT NULL,[LabExam] [int] NOT NULL) ON [PRIMARY]

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The oldest known transport wheel was discovered in 2002 in Slovenia. It is over 5,100 years old. Evidence suggests that wheels for transport didn’t become popular for a while, though. This could be because animals did a perfectly good job of carrying farming tools and humans around.Q: What might explain why transport wheels didn’t become popular for some time?

A. Few knew how to use transport wheels.
B. Humans carried farming tools just as well.
C. Animals were a good means of transport.
D. The existence of transport wheels was not known.

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再热蒸汽温度调节，一般不宜采用喷水减温作为主要调节手段。

A. 对
B. 错

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事故喷水减温器与微量喷水减温器的结构基本相同

A. 对
B. 错

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（）调节，一般作为调节再热汽温的主要手段

A. 烟气侧调节
B. 蒸汽侧调节

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