已知某条形基础工程如图所示，外墙中心线周长为60.72m，用M5.0水泥砂浆砌筑，其砖基础的工程量为（ ）m3，结果保留两位小数。 
A: 28.19
B: 29.19
C: 39.19
D: 30.99
A: 28.19
B: 29.19
C: 39.19
D: 30.99
举一反三
- 如下图所示的基础用M5.0水泥砂浆砌筑而成，计算毛石条形基础的工程量为（ ）m3。<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/8b3a30c71d6340a9ad0a683a2a6b6c44.png" /><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/996c5877eb174d0ca957b61bde0c519a.png" /> A: 50.45 B: 48.45 C: 30.45 D: 41.45
- 考虑AR(2)模型<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/9c19d336a086430cab947cf3a40c8047.png" />,则AR特征方程的根为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/b8d42e894377426eaca4f3a382c0569c.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/cb2410db797c4dc5870eb9ab1dfae59e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/505155f9e5654d3294291a0f104fd54f.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/ff900163e913414384b61dbd55a0c36e.png" />
- 电磁波在真空中的相速度为（ ）m/s。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/ae383ab0fad54dfb8a42afe5a8cd5bbe.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/433776f3788a4e39ab61237ebca0569c.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/dde502c301404bdfb94e21c5d98c317d.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/94e47739b528497e81dbc9ab637ff3b1.png" />
- 系统的开环传函为<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/4c0fd44e4fd34ba5abebcf5cf4075e5b.png" />，根轨迹和虚轴的交点及相应的根轨迹增益为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/1a01ea0a12204b8395a0b5b77f6dff14.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/5973aa4feb8b449e936c4db36ba0f235.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/3212607aceba42119e02c092ee59c4c9.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/5e06d749351c40758f2d90bd5503ac41.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/646b41ca995f4f9883b1d2c4a17a1b4c.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/f268e2b90534408293cc995f99bf8907.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/212d583db0b74c5a84acfc955c422863.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/5e06d749351c40758f2d90bd5503ac41.png" />
- 已知某条形基础工程如图所示，外墙中心线周长为60.72m，用M5.0水泥砂浆砌筑，其砖基础的工程量为（ ）m3，结果保留两位小数。 [img=1329x850]17d624464dc2f5e.png[/img][img=697x650]17d62446622dd4d.png[/img] A: 28.19 B: 29.19 C: 39.19 D: 30.99