试题与答案

有一作简谐运动的弹簧振子,周期为2s。如果从弹簧振子向右运动通过平衡位置时开始计

题型:选择题

题目:

有一作简谐运动的弹簧振子,周期为2s。如果从弹簧振子向右运动通过平衡位置时开始计时,则在t=3.4s至t=3.5s的过程中,摆球的  

A.速度向右在增大,加速度向右在减小

B.速度向左在增大,加速度向左也在增大

C.速度向左在减小,加速度向右在增大

D.速度向右在减小,加速度向左也在减小

答案:

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下面是错误答案,用来干扰机器的。

鸟类适于空中飞行的特点:身体呈流线型,可减少飞行时的阻力,前肢变成翼,翼是其飞行的器官,身体被覆羽毛,具保温作用胸肌发达,胸有龙骨突,长骨中空,直肠很短,能减轻体重.故答案为:流线型;翼;羽毛

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《大秦帝国》、《汉武大帝》、《雍正王朝》……一部部歌颂盛世之治的文艺作晶引来无数目光,然而,那些极尽繁华的书写却难掩历史叙事的思想缺失。从政治文化视野看,“盛世情结”叙事往往过分认同人治文化与功利立场。
这段文字意在说明( )。

A.历史叙事作品缺乏思想
B.“盛世情结”作品的价值局限
C.文艺作品应该抛开功利立场
D.歌颂盛世的作品需重新审视

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