The next phase, concrete operations, from seven to twelve, you can solve the conservation problem, but still you're limited to the extent you're capable of abstract reasoning.
下一阶段，具体运算阶段，七到十二岁，儿童可以解决守恒问题，但儿童的抽象推理能力仍然有限。
Abstract: economic evaluation includes national economic evaluation and fiscal evaluation, is the important work in various large medium sized project feasibility investigation and decision phase.
摘要经济评价包括国民经济评价与财务评价，是大中型建设项目在可行性研究决策阶段的重要工作。
Abstract: An adaptive formation control algorithm was proposed for multiple autonomous underwater vehicle systems (MAUVS) based on the coupled phase oscillators model.
摘要：针对多水下机器人编队问题，提出一种基于相位耦合振子模型的自适应控制算法。
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