A: Bcosβ
B: Bcotβ
C: Bsinβ
D: Btanβ
举一反三
- 三角扫描法的原理图如下图所示，其中光源与基线之间的角度β和光源与检测器之间的基线距离B是已知的,可根据几何关系求得测量距离D为（ ）[img=486x296]17d6045cd1740a5.png[/img] A: Bcosβ B: Bcotβ C: Bsinβ D: Btanβ
- 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" />
- 下图哪一个为侗族吊龙舞？（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/b41c210ce1ae4309acbbb37133e5488d.jpeg" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/2e6b6956beea42249f0a848d3b5774c1.jpeg" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/a3975e12b7bf44c39b664bb9a282c41c.jpeg" />
- 下图哪个是赛芦笙？（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/4c1126c934fe423ba279757e3c0e09db.jpeg" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/ebfd2a2c0c424420a49d73856475c011.jpeg" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/f1c495c7da6d47fc9e4166fa12dc5ba3.jpeg" />
- 下列图片中的刺绣图案属于民族风格的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/dd062ec1045547259b9430550236644d.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/f226e86915ed402bb41489e4e325d61d.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/89879b964b704c0aa90bb12d73f52f21.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/bd6ae9fac87e4482b5b4bf369728d76b.png" />
内容
- 0
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" />
- 1
<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/d2131f26059e42daa04e03a35037283f.png" />如图，已知重物的重量为500N。试确定每根绳索所承受的力。答案是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/d45dfbb2d71f4195bd952756c8150a94.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/5cb9017e0e14444aaf61888f7bb34369.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/4c1199534060441983e2384898433ef7.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/ab21403229814a07aac9152b298a6b90.png" />
- 2
<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/eeda346633f5425ab4482d83df8182a7.png" />用位移法计算图示刚架结构，下列内力计算选项正确的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/13d1ec532cc14b858e1edc9aedb9cc6c.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/e3c8e9de91074f92bdd8a4979fea19a2.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/21189921d7064cce807070431cd018a7.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/7bbedae8f3ee4b28a7f3f40dbc38cda2.png" />
- 3
具有顺反异构体的物质是 ( ) 。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/9bf08e194cf24f80b9582238a48b2d98.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/6a33a313aebe4d5a8d8f6cd250361fec.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/f7a33598bdb74c3180f03e2517cac29c.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/d86d498d7c6b4594ad58fdbaad86028c.png" />
- 4
下列最稳定的自由基是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/7ff51d95af804e74bbffb2091d336668.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/a7bc08ef90914e13a5f795670eb1e67b.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/6f85cd60c27645c39d58990b87615ebf.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/f5d0c506ba09424a838f7aee98e94e43.png" />