如果想要在数学上彻底消除“无限”“无穷”的概念,需要改变哪些现有的理论、概念等相关问题呢? | 8k8 vip | Updated: 2024-07-14 06:00:55
MOSCOW - Over 20 explosions was heard in the center of Belgorod, a Russian city some 40 km north of the border with Ukraine, amid a reactivated missile warning alert, Russia's RIA Novosti reported on Thursday.
In the center of Belgorod, near Cathedral Square, several dozens of blasts were heard against the background of a missile warning siren which had been turned on again, said the report.
About 15 minutes earlier, a siren was sounded throughout the city, followed by a spell of explosions.