在猪、鸡日粮中微量元素硒添加量通常（）mg/kg。
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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
跨两个楼层的套房称为（）。
A. 标准套房
B. 豪华套房
C. 立体套房
D. 总统套房
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