An approved constrution portfolio should be provided on all type of unit. The followingcontent should be contained in the construction portfolio:（）<br>A:The location and extent of application of different grades and strengths of materials<br>B:The approved and available welding procedure adopted in the construction<br>C:Restrictions or prohibitions of repairing or modification<br>D:None of them

An approved constrution portfolio should be provided on all type of unit. The followingcontent should be contained in the construction portfolio:（）
A:The location and extent of application of different grades and strengths of materials
B:The approved and available welding procedure adopted in the construction
C:Restrictions or prohibitions of repairing or modification
D:None of them

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