下列化合物或离子中，属于Lewis酸的是（）。
A: 碳正离子
B:
C: 碳负离子
D:
A: 碳正离子
B:
C: 碳负离子
D:
举一反三
- 下列化合物中，不具有极性的是（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/547b09efddc44eafa464beb5043142a7.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/042b473209bc447b8f7914e4efe318d2.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/60e6fcf97d024d519962631efc7a0e83.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/b06bf6679a754656b24920d3a7c120a0.png">
- 已知某变量分布属于钟形分布，且<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/c3c68d24239b47e3908a9fa39d3026e5.png">，则()。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/c289a674c3a949efb63ebfd7f5e17f73.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/14899ead117944fd93b2513951e16161.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/94c95d1322d84ebf9c0a99328b06d62b.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/0f01a113b6e14ec8ac04e74d869aea49.png">
- 下列属于{100}晶面族的晶面有（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/0add32d287a940f69e91fbae943eee76.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/13d75d49e079433096f649f812fc69a6.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/98be2e9d508448e48e920a1a5444366c.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/7e55102ed4254dd2ad54dd1c36e0dd2a.png">
- 亲核性最强的是（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/57e2c03b54f14a0a92e58cccdd920371.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/5bbbbff9b4b54e25b0e14eae38022d71.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/2ab00707a09546a1a47e7f577da4e52b.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/c092dc5bfa7e40ada1ec10b39bc5ac52.png" >
- 已知某系统模拟图如图所示，则该系统数学模型为（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/7b331e776a454b34b3ce7514c85f55ce.png" ><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/9b732439cb324b709c699aa7caf1bd43.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/3a6a819b0f204f1c861fa806fcff9bfa.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/296a376761a64a66a35f073904daa96f.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201912/6d22be023ff94910a3dc634670220912.png" >