十一届三中全会的实现了三个历史性转变,分别是______。
A. 从“以阶级斗争为纲”到以经济建设为中心
B. 从僵化半僵化到全面改革
C. 从封闭半封闭到对外开放
D. 从被动选择到主动选择
The objective of this researchis to measure the impact of employment on student achievement.
A. 对
B. 错
A heavey commitment to a part-time job has very little negative effect on students' school achievement and commitment.
A. 对
B. 错
The research shows that the safe working time should be 10 hours per week or less.
A. 对
B. 错