- A.增大体系的质量
- B.增大体系的刚度
- C.增大动荷载的幅值
- D.增大动荷软的频率
- A.3
- B.6
- C.9
- D.12
- A.4iφ<sub>B</sub>
- B.3iφ<sub>B</sub>
- C.<img src="//img1.yqda.net/question-name/60/f01a66dc4cc5aeee28e5597ecfb0ab.png" width="65" height="33"/>
- D.<img src="//img1.yqda.net/question-name/ae/3056b886e76d6cb6c18218651c5104.png" width="66" height="31"/>
- A.-25kN
- B.-5kN
- C.5kN
- D.25kN
- A.<img src="//img1.yqda.net/question-name/7d/1d95aaf652385afe15959f780e2777.png" width="25" height="32"/>
- B.<img src="//img1.yqda.net/question-name/ad/70b74f9445eea56f00ff74738cb04c.png" width="23" height="35"/>
- C.<img src="//img1.yqda.net/question-name/fe/6ba76f8c74143ddcf58387333c7dff.png" width="37" height="35"/>
- D.<img src="//img1.yqda.net/question-name/1a/0486e50693d736bea855dffc55d6da.png" width="37" height="33"/>
- A.内力相同,位移相同
- B.内力相同,位移不同
- C.内力不同,位移相同
- D.内力不同,位移不同
- 23
-
图示桁架AB杆的轴力为
- A.<img src="//img1.yqda.net/question-name/6b/90ed696215b6f0e483edf895f66bdc.png" width="32" height="25"/>
- B.<img src="//img1.yqda.net/question-name/a2/f2a68c806cd884df7c56fa8fd95936.png" width="40" height="35"/>
- C.<img src="//img1.yqda.net/question-name/3f/022b0b107ee247b1aa6fb94c85a1d8.png" width="45" height="36"/>
- D.<img src="//img1.yqda.net/question-name/c6/8868625dc0011f68ca11c179bf3a15.png" width="39" height="22"/>
- A.<img src="//img1.yqda.net/question-name/b8/71a568b72842ed272772f38b8be08e.png" width="63" height="39"/>
- B.<img src="//img1.yqda.net/question-name/a1/acf6695eb59957b9b93df1b5ae27c7.png" width="58" height="36"/>
- C.<img src="//img1.yqda.net/question-name/a6/510e49250d0c9092dd0118c05fb60a.png" width="31" height="33"/>
- D.<img src="//img1.yqda.net/question-name/c6/e40d0a1bd57ae2fa4e5a51ff8f6538.png" width="26" height="35"/>
- A.-Iφ
- B.lφ
- C.lφ-a
- D.-lφ+a题4图
- A.0
- B.<img src="//img1.yqda.net/question-name/a2/f4d223cdb43c6c5a7e47d402f58bc3.png" width="29" height="34"/>
- C.F<sub>P</sub>
- D.2F<sub>P</sub>