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【单选题】
有关均匀平面波在导电媒质中的传播特性,下列不正确的是( )。A.
传播波为TEM波，电场和磁场都在垂直于传播方向的横向平面内
B.
电场与磁场相互垂直，且电场、磁场和传播方向三者满足左手螺旋
C.
电场与磁场分量不同相
D.
本征阻抗为实数，与媒质参数 、 和频率 有关
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【简答题】阅读理解。 Trees are useful to man in three important ways. The first important way is that they provide (提供) man with wood and other products. Trees provide not only man with food, but also many animals w...
【简答题】Trees are useful to man（人类）in three very important ways. The first important way is that they provide man with food, wood and other products. Trees provide not only man with food, but also many animal...
【单选题】Trees are useful to man in three very important ways: they provide him with wood and other products they give him shade and they help to prevent droughts (干旱) and floods. Unfortunately, man has not re...
A.
Providing fuel.
B.
Offering shade.
C.
Preventing natural disaster.
D.
Providing wood.
【简答题】Trees are useful to man in three very important ways. The first important way is that they provide man with food, wood and other products. Trees provide man and animals with food to live on the earth....
【单选题】Trees are useful to man in three very important ways: they provide him with wood and other products they give him shade and they help to prevent droughts (干旱) and floods. Unfortunately, man has not re...
A.
Providing fuel.
B.
Offering shade.
C.
Preventing natural disaster.
D.
Providing wood.
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