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The incident also comes almost 30 years to the day since Cuban defence forces shot down two small civilian planes belonging to Brothers to the Rescue, a US-based group that searched for rafts carrying migrants from Cuba to the US.
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到2030年，实现高校科普工作全覆盖，高校科普工作体系更加完善，高校科普地位作用更加凸显，科学素质和能力培养导向更加鲜明，高校社会化科普服务效能更加彰显，服务国家创新驱动发展的贡献度进一步提升。
2.3 ReLU（Rectified Linear Unit）