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蒙古族人民最重要的节庆是什么？

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Once a vessel has loaded packaged hazardous cargo，the cargo spaces shall be inspected. The spaces shall also be inspected at least once in every 24 hours. The only exception to daily inspection is when（）.

A. a vessel is equipped with an automatic smoke or fire detecting system
B. the cargo hatches are of steel construction
C. the cargo is of a nonflammable type
D. there is sufficient fire protection located on the main deck adjacent to the cargo hatch

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蒙古族人民最重要的节庆是什么？

在猪、鸡日粮中微量元素硒添加量通常（）mg/kg。

由于接触生产性毒物引起的中毒，称为（）中毒。

早期象征诗派的代表诗人是（），他的代表作是（）。

Once a vessel has loaded packaged hazardous cargo，the cargo spaces shall be inspected. The spaces shall also be inspected at least once in every 24 hours. The only exception to daily inspection is when（）.