水泥混凝土路面浇筑后,表面没有及时覆盖,在炎热或大风天气,表面游离水分蒸发过快,体积急剧收缩,最容易产生的病害是(  )

水泥混凝土路面浇筑后,表面没有及时覆盖,在炎热或大风天气,表面游离水分蒸发过快,体积急剧收缩,最容易产生的病害是(  )。 A.断板 B.板底脱空 C.龟裂 D

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自动安平水准仪操作程序是(  )。

自动安平水准仪操作程序是(  )。 A.粗平→照准→精平→读数 B.照准→精平→读数 C.粗平→照准→读数 D.对中→照准→读数

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Economic development depends on the extraction of natural re

Economic development depends on the extraction of natural resources and on low-s

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Many a delegate was in favor of his proposal that a special

Many a delegate was in favor of his proposal that a special committee _________

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James Callaghan's attitude towards computers can be best de

James Callaghan's attitude towards computers can be best described as _________

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