D42x版本升级方式有（）？
A.页面升级
B.生产工具升级
C.远程自动升级
D.TR069升级
参考答案：A, B, C, D
牙隐裂检查时最有帮助的检查是（）
A.视诊
B.探诊
C.X线
D.涂碘染色
E.温度测验
In relation to employment law explain the meaning of redundancy and the rules that govern it. (10 marks)
