如图所示铸铁梁，根据正应力强度 的截面形状较合理。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/b5fc9dcd1bdf412db30009cf5fcc6730.jpg
举一反三
- 如图所示，铸铁梁有A，B，C和D四种截面形状可以供选取，根据正应力强度，采用（ ）图的截面形状较合理。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/abc242c650614908b2d73e7bdffef45d.png
- 电路如图5所示，运算放大器构成 。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/ad0dc8cc2e8547ccb31a035a818c1d8d.png
- 如图所示铸铁梁，根据正应力强度 的截面形状较合理。
- 一等截面铸铁梁的弯矩图如图所示，设计梁的截面时，最合理的截面应该是图（）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201710/26097b8852214fc8b3a0f6f531e87851.png
- 当_____时，大气气团处于稳定状态。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/cfd65918697d4e5aac32ffa652eeeb44.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/3627620c7b20481c9fd4d9816cbe61d3.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/da408a1038da41b2a6f4022dd469857f.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/50437c56e4e340e59d42b59bc26d9802.png">