举一反三
- 解 稳 定 问 题 时 ， 将 图 a 所 示 弹 性 杆 件 体 系 ， 简 化 为 图 b 弹 性 支 承 单 个 杆件 ， 其 弹 性 支 承刚 度 系 数 为 ( )http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/02b9ec16a2f54abb943381f5e3ee7bf8.png
- 图 示 弹 性 支 承 刚 性 压 杆 （ ）体 系 的 稳 定 自 由 度 为 1。 （ ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/be118afbd2894ce6957dcbc7ac3d38ed.png
- 以下哪个结构流图对应的是IIR滤波器？ A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/004c7c38e68d441093257571330500b2.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/666abf96f5e64a438faf00a0a678434a.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/7641806854794e039629fe56c2c53424.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" />
内容
- 0
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">
- 1
满足下列哪种条件的序列称为共轭反对称序列________________。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/6f863bbc8ebe4bf6ae1cd9dac3c3ed35.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/d236b2f70770439e90970575096b4e8a.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/d6001dee52dd461ea635a85cf670a223.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/e93566380bac4600b77f3bc5c90b5971.png" />
- 2
图示有侧移结构，设横梁的水平侧移为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5b1b0d2260734afd9d372476eccd0a52.png"/>，计算约束状态下杆件的固端弯矩，正确的是（ ）<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/0bb431e37a424b1f841ad9350d80f241.png"/> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/ef65ff72dc6b4179bee92ce4ff148aad.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5ca987b52284485a986cb954a09b51a0.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/0c7f5a6de2714ac0bbb5a243d9b8da4b.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/94aab58ed2f94f90af7c4ea00aecf764.png"/>
- 3
一简谐振动的旋转矢量图如右图，设图中圆的半径为R，则该简谐振动的振动方程为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/dfd995a36f4e4dd2adb52a50cc5a26de.png"/> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/e69d65d5dd4e49f9863425ce3fb5ac54.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/b13da9634fc9435398489686c8d362f9.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/e7906edc65b14dc39bafcb683986a690.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/0bfe1b068eac44d59d8772eb9bcbf871.png"/>
- 4
在横截面积等其他条件均相同的条件下，压杆采用（）所示的截面形状，其稳定性最好。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/cde5a8d5534f40b890e9156e7f05ea94.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/41e79439d2fd46fca429c2663fe0bbca.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/af2d8363d9be44bd8dc3f3e96310748b.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/d427ec9070724523b4f4d924c2a2daf0.png" />