下图中回路是正反馈。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/f21129eeea85491a9a5f116e5876a0fc.jpg
举一反三
- 下图中回路是负反馈。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/e61f41bf66fd4d889013b885ac2af2c8.jpg
- 以下图片中一共有几个反馈回路？http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/add96fc6fd524c82bd9af9fe38141878.png
- 下列结论不正确的是 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/903dc792ad1c4b8ba36246edced45e2e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/b0d73b80b2734bb6b37cd96300e46fa3.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/b71e248464754f2f9cf39c6c2bef2a49.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/dc30dde832db4b9294ee2e29292180dc.png" />
- 以下哪些图片可表示马太效应？ A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/9f53557496f648f294946ddeee28f835.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/fd1d1c8153324ff58fec7e98aafa4765.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/998d04a09cb545d1aa9cd734208a020f.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/c67cb20670694e0ea0e3e63a3d083975.png" />
- 在有机合成中保护羰基的常用试剂是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/371d833b0e4f4b089b6d370f81115237.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/f4e3ab0a87704e6e835c94027c494801.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/7c7c482b43fe422c88bdd075b3a0b984.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/a3a58d1832fd4ebdb3be9bc2dd9a1d01.png">