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判断下列各图所示体系的几何构造性质为：（）
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发电市场运营系统主要包括()。A、CMSB、BPSC、SBSD、BSS
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一般情况下，（）对密封有利。
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古希腊多种多样的自然哲学主要内容是什么？
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2014年3月1日，甲公司自非关联方处以4000万元取得了乙公司80%有表决权的股份，并能控制乙公司。当日，乙公司可辨认净资产公允价值为4500万元。2016年1月20日，甲公司在不丧失控制权的情况下，将其持有的乙公司80%股权中的20%对外出售，取得价款1580万元。出售当日，乙公司以2014年3月1日的净资产公允价值为基础持续计算的净资产为9000万元，不考虑增值税等相关税费及其他因素。下列关于甲公司2016年的会计处理表述中，正确的有（）。
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Choose the best words into the sentences. Sudan is the only male northern white rhino (犀牛) left in the world. That (mean) Sudan, 42, is the last hope for avoiding extinction. (protect) him, officials have placed him under 24-hour armed guard at the OI Pejeta Conservancy in central Kenya. Sudan lives there two female northern white rhinos, Fatu and Najin. Northern white rhinos, can weigh up to 5,000 pounds, were once plentiful across northern and central Africa. (hunter) have killed thousands of rhinos because of high demand for the animals，horns (角). Rhino horns, believed to have medical effects, are used in (tradition) Asian medicines. More than 1,000 rhinos (kill) in 2014 in South Africa alone and fifty-four rhinos in Kenya, which has a much (small) population. Sudan, Fatu, and Najin have had their horns (remove) so that they will not be hunted. People hope Sudan and one of the females will be able to have a baby. Sudan is very old, but scientists will not give up hope.
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船用柴油机冷却水质应及时处理，这是因为水中含有（）。
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陶渊明是（）的人。
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丁二烯在常压下的爆炸极限为（）。