2. 自考
  3. For long-time efficiency and happiness it is best to observe the ______ of health and sound working conditions.

For long-time efficiency and happiness it is best to observe the ______ of health and sound working conditions.

admin2017-06-30  57
问题 For long-time efficiency and happiness it is best to observe the ______ of health and sound working conditions.
选项 A、principles
B、ideas
C、elements
D、factors
答案A
解析
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