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【单选题】
测定水泥时间,当临近时,应每隔()min测一,当临近终凝时,应每隔()min测一次。A.
5,5
B.
5,15
C.
15, 15
D.
15, 30
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A.
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B.
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C.
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D.
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A.
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B.
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A.
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B.
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