【单选题】根据《多边投资担保机构公约》设立的多边投资担保机构()。
【单选题】Her uncle _____ to the factory. He'll be back _____ an hour. [ ]
【单选题】AERONAUTIC SYSTEMS, INC., the Berlin-based company also known as AeroSys, has made an agreement with three of the world's major international airlines to provide a satellite system for voice and data ...
【简答题】渗漉法优点的叙述,正确的是 A 、有良好的浓度梯度 B 、溶媒的用量较浸渍法少 C 、操作比浸渍法简单易行 D 、浸出效果较浸渍法好