以下哪个可能是红外发射管? <img src="http://static.cnmooc.org/repositry/umeditor/i/1809/21/3ae9e2e59549454a9b070ff118168864.jpg" />|<img src="http://static.cnmooc.org/repositry/umeditor/i/1809/21/394f173e66bd4376b5fcef9c399105b6.jpg" />|<img src="http://static.cnmooc.org/repositry/umeditor/i/1809/21/502a44e8f77f40078a8d9519a1e6923a.jpg" />|<img src="http://static.cnmooc.org/repositry/umeditor/i/1809/21/dd21e7635f994ad1a0134d620715fb1f.jpg" />
以下哪个可能是红外发射管? <img src="http://static.cnmooc.org/repositry/umeditor/i/1809/21/3ae9e2e59549454a9b070ff118168864.jpg" />|<img src="http://static.cnmooc.org/repositry/umeditor/i/1809/21/394f173e66bd4376b5fcef9c399105b6.jpg" />|<img src="http://static.cnmooc.org/repositry/umeditor/i/1809/21/502a44e8f77f40078a8d9519a1e6923a.jpg" />|<img src="http://static.cnmooc.org/repositry/umeditor/i/1809/21/dd21e7635f994ad1a0134d620715fb1f.jpg" />
Washington Irving’s first book appeared in 1809, entitled ______.
Washington Irving’s first book appeared in 1809, entitled ______.
以下语句的输出结果是________。 A: $1.732 B: $$1.732 C: $1732 D: $$0001.732
以下语句的输出结果是________。 A: $1.732 B: $$1.732 C: $1732 D: $$0001.732
From 1732 to 1758, Benjamin Franklin wrote and published his famous __________ , an annal collection of proverbs. 可用
From 1732 to 1758, Benjamin Franklin wrote and published his famous __________ , an annal collection of proverbs. 可用
中国大学MOOC: Songs of Innocence, published in 1809, is a lovely volume of poems. The poems praise _______.
中国大学MOOC: Songs of Innocence, published in 1809, is a lovely volume of poems. The poems praise _______.
In what year was the Jami-Ul-Alfar Mosque completed? A: 1909 B: 1809 C: 1908 D: 1890
In what year was the Jami-Ul-Alfar Mosque completed? A: 1909 B: 1809 C: 1908 D: 1890
蓝山咖啡是哪年被引进的生产国？ A: 1723 B: 1728 C: 1730 D: 1732
蓝山咖啡是哪年被引进的生产国？ A: 1723 B: 1728 C: 1730 D: 1732
第一架钢琴是（）年发明的 A: 1709 B: 1809 C: 1909 D: 1609
第一架钢琴是（）年发明的 A: 1709 B: 1809 C: 1909 D: 1609
第一架钢琴是（）年制成的。 A: 1809 B: 1609 C: 1709 D: 1790
第一架钢琴是（）年制成的。 A: 1809 B: 1609 C: 1709 D: 1790
世界上第一架钢琴是什么时候产生的（） A: 1709 B: 1800 C: 1719 D: 1809
世界上第一架钢琴是什么时候产生的（） A: 1709 B: 1800 C: 1719 D: 1809