【单选题】何谓最小偏向角?
A.
经棱镜两次折射,入射光线和出射光线延长线的夹角。
C.
经棱镜第二次折射,分界面处的入射光线和出射光线的夹角。
【简答题】Please fill in the blanks according to what you hear. 1) __________ is a big problem. Many places on 2) __________ are not clean. There is 3) __________ on the land and in the water. The air is 4) ___...
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【判断题】MODEM的传输速率56Kbps是指上行速率为56Kbps 。
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