题目内容

由单球面折射公式可知,物距一定,球面的曲率半径变大,则( )

A. 焦度增大,像距增大
B. 焦度增大,像距变小
C. 焦度变小,像距增大
D. 焦度变小,像距变小

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正常人眼视近物的调节主要是通过()

A. 增大角膜的曲率
B. 减小角膜的曲率
C. 减小晶状体的曲率
D. 增大晶状体的曲率

屈光度为2.5D的薄透镜的焦距为()

A. 0.4m
B. 0.1m
C. 2.5m
D. 0.2m

[音频]Instead, I visited the writing 1______ — there is one in every 2______ residential hall — for every paper I 3_______. My papers were always written days before they were 4____. I 5_____ after classes to question professors. My classmates lent me their notes so I could learn the skill of note-taking in English.

有一填坑,其土方量为1000 m3,使用斗容量 3 m3 的汽车运土,每车运费10元,请问填满夯实此坑需多少运费?(Ks=1.25, K′s=1.1)。

A. 3678
B. 3388
C. 3578
D. 3898
E. 3768
F. 3788
G. 4078

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