【单选题】折射率为n2、厚度为e的透明介质薄膜的上方和下方的透明介质的折射率分别为n1和n3,已知n1<n2<n3.若用波长为l的单色平行光垂直入射到该薄膜上,则从薄膜上、下两表面反射的光束的光程差是
【判断题】《我的母亲》的作者是老舍,原名舒庆春,字舍予,被授予“人民艺术家”的称号。
【单选题】鲁迅先生说:“假如我们设立一个‘肚子饿了怎么办’的题目,拖出古人来质问罢,倘说‘肚子饿了应该争食吃’,则即使这人是秦桧,我赞成他,倘说‘应该打嘴巴’,那就是岳飞,也必须反对。”这段论述表明 1真理是具体的有条件的 2任何真理都包含着谬误的成分,要正确对待错误 3真理面前人人平等 4真理具有客观性
【判断题】《我的母亲》的作者老舍,原名舒庆春,字舍予。
【单选题】Why do the artists run a significant risk of losing the audience's favor?
A.
Becuse they don't make changes.
B.
Because their work begins to show a lack of continuity in its appeal.
C.
Because the public simply discounts styles other than those for which the artist has become famous.
D.
Because they don't work harder than before.
【简答题】according to the author, why do many artists, writers and statesmen achive prosperity?
【单选题】下面 哪 部著作是阿 兰 · 邓 迪思斯所著