下列各对函数中，两函数相同的是（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/005a115bac08495eb95962c7071a78f1.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/a527471aab444488884fca1d17d9d400.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3a0e26b4b4f44ceaa2ac479ce599077d.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3430e6031b074123a928985c91d4bf44.png">

在纯电容电路中，电压和电流的关系应为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3e829c34dee64700a6d7c47703fac813.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/76f4755b138c42dcb27c8c006369dd09.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/99d49adf0f7142ef91f9c78e42ba24b0.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d5322333240046d382b302f48318d1cb.png"> E: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c5689885a941415493404a53dbf5e03b.png">

这件青铜匜腹部是弦纹。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/61dc896b65ac4ecda40bf29e277e7c1d.png

下面的式子哪一个是描述非稳态导热的第二类边界条件（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e5c09095c9ab4cb1a306ed310492693f.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/9f45cc2e4b664e81818435678aeb5573.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/bba03a54fa5e4b7eaacb1931ebcec58d.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/fd19c6b572144904a5c6411704e7aa1d.png">

https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/8f51f32645924628b0a48204edad9723.pnghttp://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/8d2c216b52524ff39b166bf193c7d6c0.jpg<br>