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【多选题】
关于碳化深度测量的说法中，正确的是()
A.
测点数不应少于构件测区数的30%
B.
测点数不应少于构件测区数的20%
C.
当碳化深度值极差大于1.0mm时，应在每一测区分别测量碳化深度值
D.
当碳化深度值极差大于2.0mm时，应在每一测区分别测量碳化深度值
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【单选题】Passage Three In recent years there has been an increasing number of large oil spills. These spills, some of which have occurred directly at the site of extraction and others during tran...
A.
immediately
B.
after quite a long time
C.
few years later
D.
after several months
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【单选题】Passage Three In recent years there has been an increasing number of large oil spills. These spills, some of which have occurred directly at the site of extraction and others during tran...
A.
immediately
B.
after quite a long time
C.
few years later
D.
after several months
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