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Rear-end crash is one of the important types of road traffic accidents with the characteristics of heavy casualties. Among the accidents, it has caused greater casualties and higher mortality in the passenger car crash into truck accidents. According to the analysis of lots of traffic accidents, it's found that the truck rear under-run protection device has good protective effect and can reduce casualties...
In this paper, aiming at the problem that improves the professional quality of junior middle school English teachers we conducted a study, and put forward an evaluation model of junior middle school English teachers' professional quality under the background of "the trinity" based on the coefficient of variation method. Coefficient of variation method is the direct use of the indicators...
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