【单选题】水在 100°C,标准压力下沸腾时,体系的吉布斯自由能变化为()
【单选题】We are pleased to know that you have planned to come to the Autumn Guangzhou Fair. We wish to discuss with you some other important things if you could come ______ your earliest convenience.
【单选题】12号提速道岔尖轨非工作边与基本轨工作边的最小距离为()mm,容许误差“+”不限,“-”为2mm(中级线路工用)。
【单选题】Can you understand the picture?
【简答题】If you wish us to act ______ your agent in this area. we can provide you ______ first class reference.