图中的平面ABCD和直线EF的相对位置关系为（ ）。A: 垂直
B: 相交
C: 平行
举一反三
- 比较两个一位二进制数A和B,当A=B时输出F=1,则F的表达式是（ ）。 A: F=A⊙B B: F=AB C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/92cca51ed8dd46e98c023da4ed4a3710.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/63fb5e7770cb421fafe5b574023a5bf9.png" />
- 下列关系正确的有（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/0c9a6360c85f4ff9bdb2b17b576df2e0.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/09c3ca64214040d89eaa8534fa21d895.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/3d88f37ec20c4604a8387c0e1088ad34.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/d48f61b369aa425384b1d565afb5d073.png" />
- 图示一平面平行平衡力系，下面的平衡方程中不独立的平衡方程组是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/cf3a08552fe84c818e14753343bcc9ae.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/27dbb605b73e44a7b97a1731ca589ca2.png" /> <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/7531bddcbee3484e845d013bcb77bf6b.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/7ebbe157b1bf4333a4b7ab7c869675c2.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/da2870ffc25f436d8a875693fe06783e.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
- 阿糖胞苷的化学结构为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/588c9b478695464b9617893b2e1c303a.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/86b60f7b512f43a29c8431f882722d1b.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/4546ccb30ea64350a626b0cd337e2c98.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/8f610edce6dd4a2e81ca814690e0b5ec.png" />