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在轿厢上行或下行的速度达到限速器动作速度之前，限速器或其他装置上的一个符合规定的电气安全装置使电梯驱动主机（）。
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患者王某，女性，36岁，体重50kg，血型O型，贫血待查入院。既往有多次输血与妊娠史。血常规示：血红蛋白80g/L，血小板60×109/L，白细胞6.2×109/L。对患者进行抗体筛查与交叉配血试验，以下说法正确的是（）。
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信用保险公司承保的出口信贷，只负担一部分风险，一般不超过信贷总额的（），其余部分仍由投保人负担。
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患者，男，右上2、1和左上1、2因外伤导致牙体缺损，拟烤瓷牙单冠修复，无氟牙症、四环素牙等病史。关于制作瓷层后颜色的调整，以下说法哪项正确？（）
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研究蛋白质的分类学价值时采用以下各种研究方法（除（）以外）。
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有关像素和体素不准确的概念是（）
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旅客单件行包体积不得超过（）。
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我国国家审计总目标可以概括为（）。
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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.