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聚乙烯管道和钢骨架聚乙烯复合管道埋设的最小覆土厚度(地面至管顶)应符合下列规定:埋设在车行道下时,不得小于( );
A.1.2m
B.0.9m
C.1m
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(句子释义)Today an appearance on a television talk show is the ultimate proof of ”making it”in America.()
A.…an important sign of what you are doing in America.
B.…strong evidence that you have adjusted to life in America.
C.…the best proof that you have succeeded in the United States.
D.…the last proof that you have been accepted by American society.
A.()
A.…an
B.
B.…strong
C.
C.…the
D.
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沥青混合料中填料宜采用( )矿粉。
A.酸性岩石
B.碱性岩石
C.中性岩石
D.亲水性岩石
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