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【单选题】
当填方土料为黏土和砂土时,正确的填土顺序是()。A.
将两种土混合均匀后再填
B.
可不分先后随意填
C.
先分层填砂，后分层填黏土
D.
先分层填黏土并填成一定斜坡，后分层填砂土
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B.
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C.
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先在文档开头用拖运操作选取一段文字,然后在文档尾按住Shift键再单击左键
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