以下四棱锥表面上点的投影，错误的是（）
A: F点
B: E点
C: D点
D: C点
A: F点
B: E点
C: D点
D: C点
举一反三
- Z7-02-07一均匀静电场，电场强度<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/fcad4db83c47436faaab0bbfb23f3c54.png" >,则点<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/b71780376f344c85a02d5618a5d85738.png" >和点<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/a8a709b5f0834a02bd8eb81e936a6853.png" >之间的电势差<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/7c97c84370504f52a1ffff50d2d6a8d3.png" >。(<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/47c9ae0fb2dd45b985cf186aef82bb57.png" >以米计)()
- 采用基2时间抽取FFT算法计算<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/f67e1917247149b497ced3c3798bea9a.png" />点序列的DFT，以下（ ）流图是正确的。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/76a32272ec1c4ab7a7efff7430a72d78.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/5398db8fd5714235b18480d2d9d3cfae.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/79bb453e60504ef195ebe4368d76c8a5.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/d521c85331ce46948d059dd2875d17e7.png" />
- 以下三视图投影正确的是（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/409405865227458ca6c469f162933461.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/ba292c1fa8d44cd18c9218f02b6b0729.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/fcae4be4443240899074ee15cf539c6a.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/210e9147cda14ec1a4479d10a066a239.png" >
- 以下三视图中投影正确的是（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/9b8e16b5f10f4b0e82a8e195ac36b28c.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/6acd50082fd1445baac14a22fcdb9a84.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/721f4c5fd09c412d94f76ab2ae4f2bba.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/99ec7f31ff0847879b3a20bf1ae45922.png" >
- 下列结论正确的是( ) A: 如果函数f(x)在点x=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/fdcb3c002c53441fa69fd9fc3076a5be.png" />处不可导，则f(x)在点x=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/fccedfd766654505ba6969e49597bb90.png" />处也可能连续 B: 如果函数f(x)在点x=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/450601f103e541c59a2bcaf43473c913.png" />处可导，则f(x)在点x=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/ac603e6c25944a939bc20a352e35e40b.png" />处连续 C: 如果函数f(x)在点x=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/59143c94d1554ce7b1c4188c63dd7dc8.png" />处连续，则f(x)在点x=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/10cd24ef2c2b47b08193284458b6c8cd.png" />处可导 D: 如果函数f(x)在点x=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/e1b59bf3878c483f817cd90a0b46acea.png" />处不连续，则f(x)在点x=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/a1d323d5a3e14eff887de62c708c931f.png" />处不可导