已知主、俯视图，若将主视图改为半剖视图，正确的是（）。<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/e6416653b88a4158a0b1fa78a1b000d0.png" > A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/aa82277795e04524a4d095bfb86f4f36.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/bfa603b5c9924802a09b956f16ff13d6.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/fff8cbcbe2244549b64dfa0b0a28d974.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/56e50b15486c4d1cbc1076daf2f499fd.png" >

Z6-02-08电荷<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/036027dbeb26418aa7bb260d967f3f40.png" >和<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/44c9228d05d1468b9515d934abae4a67.png" >在真空中的分布如Q_02232图所示,其中<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/72c15784c1644df19af63a63d5be6402.png" >是半径为<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/c7a4c4f6710b48e1970654e6f5ae5c0f.png" >的均匀带电球体，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/0c6c1d84c1254e74a9239f35a8c904d4.png" >为闭合曲面，则通过闭合曲面<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/0c6c1d84c1254e74a9239f35a8c904d4.png" >的电通量<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/5f27516d8ace42029cf4129c9b5aa0df.png" >。()<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/1136a559879244f9bcae368a71700e8b.jpeg" >

如果一个氢原子的电离能是<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/4dcf071313154d0ea93225d9a406e985.png" />， 则一个<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/c89b325c3d164b7d9865e00605b006ca.png" /> 离子的电离能为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/85d5e9042a93497abfa3bb96856e78d2.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/4dcf071313154d0ea93225d9a406e985.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/411f7e2e2ee84fe4982c3fad6b02ce4f.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/4da15d5c01a442eb9bcb6fc2fd30f12e.png" />

假定消费者收入为m，则对于C-D型效用函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/cad6801a0e644022b0c2fe95e8a19989.png">，最优选择满足（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/cdf29b903396427293c59cf0351953f4.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/f72e0dd95fd74bcfb1d0ad01736f7efc.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/898a974abc0042deb61446fbb7c0f44a.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/9e2fdd685d034af19b433d9185e329e5.png">

企业的生产函数为<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/424d9077d00542c5922bc85377f8f7ab.png">，短期<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/2241f8850c5a42fdbc0da06e2fe66643.png">投入固定，两种要素价格为（2,2），则价格大于16时，企业的供给函数为（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/f7eee9993fbd4a66911a2d7f4a9dda74.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/696bb304372d46ed8c2047e26e636d91.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/8d1bbf2b88f449b88af9f43247176895.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/69a898e613ae4ff6b1cf312cbd01fd16.png">