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【单选题】
可视光中按波长长短分为三种,即短波长的光,主要呈蓝色;中波长的光,主要呈绿色;()的光,主要呈红色。A.
短波长
B.
长波长
C.
中波长
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【单选题】Be certain of the number you’re dialing, so as to avoid disturbing someone unnecessarily. If you do reach a wrong number, it is necessary to say“I’m sorry. I dialed the wrong number .” before hanging ...
A.
annoy
B.
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C.
know
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