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简述OSI参考模型数据链路层和网络层的功能?
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【简答题】设图二极管电路中二极管均为理想的，求u o 和i o 。
【简答题】Choose the correct concluding sentence. Pizza has become one of America's favorite foods. Pizza is ordered for many
various holidays and s, including Halloween, the Super Bowl, and the night
befo...
【单选题】According to the article, if someone is on a diet, he ______.
A.
should not eat all the foods he loves
B.
has to eat very little
C.
may not enjoy anything he likes
D.
can enjoy various foods
【简答题】一点沿对数螺线运动r=e^aφ，它的极径以角速度ω旋转，试求极径变化率.一点沿对数螺线 运动，它的极径以角速度ω 旋转，试求极径变化率 .
【简答题】图所示电路中，VD为理想二极管。求：
【简答题】求下列极： (1) (2) (3) (4) (5) (6) (7)
【简答题】求线性谐振子偶极跃迁的选择定则．
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