以下代码的输出结果是（ ）ls = [“2020”,”1903”,”Python”]ls.append(2050)ls.append([2020,”2020”])print(ls) A: [‘2020’,’1903’,’Python’,2020,[2050,’2020’]] B: [‘2020’,’1903’,’Python’,2020] C: [‘2020’,’1903’,’Python’,2050,[2020,’2020’]] D: [‘2020’,’1903’,’Python’,2050,[‘2020’]]

阅读以下程序，其运行结果为（ ） ls=['2020','1903','Python'] Is.append(2050) Is.append([2020,'2020']) print(ls) A: ['2020', '1903', 'Python', 2050, 2020, '2020'] B: ['2020', '1903', 'Python', 2050, [2020, '2020']] C: ['2020', '1903', 'Python', 2050] D: ['2020', '1903', 'Python', 2050, [ '2020']]

莱特兄弟1903

In 1903, an American Henry Adams is stra... and .

In 1903, an American Henry Adams is stra... and .

In 1903, Mikhail Tsvet invented chromatography, an important__1__ technique.

【单选题】()年,中华护士会正式成立。 A 、 1903 B 、 1905 C 、 1907 D 、 1909 A. 1903 B. 1905 C. 1907 D. 1909

第一架飞机诞生的时间是哪一天？ A: 1903/12/17 B: 1901/12/17 C: 1903/12/23 D: 1901/12/23

1903: ________. 1908: ________. 1913: ________. 1916: ________. 1919: ________. 1923: ________. 1926: ________. 1927: ________.

1903 年，加拿大要求入境华人缴纳人头税