-
1787年美国宪法在制定过程中充分考虑了公民权利问题，拟定了相关条款。
-
-
正常生产时，提高离心式压缩机转速，下面说法正确的是（）。
-
光纤直放站中继端机安装点A点到覆盖端机安装点B点之间仅有一条两个窗口空闭的光纤，那么直放站两点间的信号传输方式为单纤传输方式，系统共需2台波分复用器。
-
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.
-
沙丁胺醇（万托林）治疗哮喘急性发作的药理基础为（）
-
简述法律方法的概念与特征。(武汉理工2009年研；山东大学2008年研)
-
已知某种粉尘的粒径分布符合对数正态分布，且几何标准差为1.4，个数中位径为21.5μm，则其表面积平直径为（）。
-
缓冲溶液
-
下列哪项不是肺癌的肺外表现（）