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题目：
未知类型
A.党的军队
B.人民的军队
C.国家的军队
D.政府的军队
答案：
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在ICP-AES法中，为什么必须特别重视标准溶液的配制？
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小明随妈妈去花市买花，店老板说：“我只有牡丹、玫瑰、康乃馨和百合花。”妈妈听了，对小明说：“你最少选一种，最多选四种。”请问小明有（）种不同选法。
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DNA和RNA彻底水解后的产物()。
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时间分辨率常见的英文表达方式是（）
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应预防性应用抗菌药物的是（）.
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染色与其他化纤混纺机织平布
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低压电网架空导线的种类有裸导线和绝缘导线两种。
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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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数控机床闭环控制系统的位置检测装置装在()。