矿井维修电工必须经过培训，考试合格，并持证上岗。
参考答案：对
马斯洛需求层次理论的高级需要包括自尊的需要和（）的需要。
A.生理需要
B.自我实现
C.社会
D.安全
In order to _____ the heart of his former lover,Tom gave up smoking,but all his effort went to waste. [ ]
A. win back
B. get back
C. bring back
D. take back
