员工培训情况录功能描述：每月统计各类培训次数和人次，维护（）、（）、培训内容、培训课程、参加人员成绩等内容。
参考答案：培训时间；培训地点
切缘部分瓷的厚度是
A．0.1～0.2mm B．0.3～0.4mm C．0.8～0.9mm D．1.1～1.2mm E．1.5～2.0mm
Which of the following statements about Langerhans’ cells is TRUE
A．They commonly are found in the dermis
B．They function as sensory mechanoreceptors
C．They function as receptors for cold
D．They play an immunologic role in the skin
E． They are of epithelial origin
