back strength
短语词组
- back k strength 背力
- back -fill strength 充填体强度
- Back -part strength test 靠背强度测试
- back strength test -static-type II &III 靠背静态强度测
- Back strength test -static-type I 靠背静态强度测
- strength of back flow 回流强度
- FEM back -analysis from instability-strength degradation 有限元失稳 返回 back strength