1765年，英国的谁制成功分离冷凝器的单动式蒸汽机，1769年获得专利
参考答案：
詹姆斯·瓦特研
(2013·龙岩一模)—________ so many countries, you must be able to speak several different languages.
—I wish I could, but English is the only one I can speak.
A．Visiting
B．To visit
C．To have visited
D．Having visited
豌豆种子
