5.“屋面卷材防水”中的水泥砂浆保护层、细石混凝土保护层不能包括在屋面防水项目内。（ ）
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Why do we need to determine the origin of the goods?
What has added to the difficulty of determining the country of origin?
What is the negative impact of complex rules of origin?
Which section will focus on the use of the rules of origin as a tool of economic development?
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