职业健康教育的关键是（）。
A.知识学习
B.观念转变
C.态度转变
D.信念转变
E.行为转变
参考答案：E
文献检索分为____和________
Which one of the following describes the similarity between the stack and the queue (75)
A．logical characteristics
B．physical characteristics
C．operation method
D．element type
