已知自由空间中电磁波的电场的磁场表达式分别为：
，则坡印廷矢量为：（ ）https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/3972fa9db6154fdca8631b95f01b44af.png
，则坡印廷矢量为：（ ）https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/3972fa9db6154fdca8631b95f01b44af.png
举一反三
- 已知自由空间中电磁波的电场的磁场表达式分别为： ，则坡印廷矢量为：（ ）[img=371x61]17a412b2eab14a2.png[/img]
- 已知，则函数y(x)的表达式为( )https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/49a4830769224581b8e102bf1507a29a.png
- 100℃、101.325kPa的液体水在恒温恒压下蒸发为100℃、101.325kPa的水蒸气，正确的是（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/9b05677cbb9c472f9af7e102bb8d17c1.png"><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/e1a83303d2d1494483adca2a060c80cb.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/9b05677cbb9c472f9af7e102bb8d17c1.png"><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/df74602b8ce94436a655b0ad6be55992.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/719aab16e84c41ce98c5cec98806fb5a.png"><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/e1a83303d2d1494483adca2a060c80cb.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/2aa4364acba745cc9b6acbacbfe779fa.png"><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/ba0ef9e37abe4b4dadfb22c9963dfe96.png">
- 下述结论错误的是() A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/adb814d7cabc4eca99d32a7e09395657.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/b4d95904373b47629b318110aa0e3573.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/edcdaa8dddab48569fc04ec01585a366.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/61e6c2c62a014a779e9bce85b312fc37.png" >
- 下面区间列为区间套的是（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/05ed5e934eff4c5aa091b920993a48df.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/754cf28295964e56948731a8b495ef08.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/9586a227bcf74db2a3b760363b8fd7b3.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202001/32c655723ea946c8ac37d7cbf2b43f80.png" >