二级防护
- 网络secondary containment
二级防护-
OR<1且P<0.05的有：规范使用标准防护用品、二级防护方式、良好的心理状况及吸烟。
The factors ( OR < 1 and P < 0.05 ) were : canonically using standard protective equipment , second class protection method , good mentality condition and smoking .
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平微区二级公路边坡防护设计探讨
Investigation on design for protection of side slope On secondary road on hill in plain zone