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(A) infrared radiation is too long to be registered by the eye
(C) infrared radiation is too long for the eye to register it
(D) infrared radiation is too long for the eye to register
这3 个有什么 区别?
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谢谢 rosmarine. 又是你. .感谢感谢!! 有缘见面的话,一定请你吃饭!1
错的,都能给我说明白! 厉害 . 我懂了..
A/D没错
C有问题
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