在法律程序中，NLP实践者应该如何表现？

在优化器原理中，以下哪种优化器不使用动量来加速梯度下降？

在数据库中，哪种约束用于确保列中的所有值都是唯一的？

In a certain country, the government has implemented a new policy to reduce air pollution by limiting the number of vehicles on the road. However, this policy has led to an increase in public transportation usage. Which of the following statements best describes the potential impact of this policy on urban development?

以下哪个Java标识符定义体现了大小写敏感原则，并明确区分了不同的变量？