题目内容
血液的PH值正常参考范围是()
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A steel structure workshop (without crane and internal mezzanine floor) is designed with a span of 30 m, and there is little difference between eaves height and mid-span height, so it is most suitable for use the ( ).
Which of the following structural members belongs to the primary steelwork of portal frame buildings. ( ) (There are more than one correct choice)
Which of the following structural members belongs to the secondary steelwork of portal frame buildings. ( ) (There are more than one correct choice)
Portal frames resist horizontal and vertical loads mainly by（ ）.(There is not less than one correct choice)
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