Too many virtual experiments in electronic and electrical class internal are still stay the edge that can not allow users to edit and extend the equipment library.

国内的电子电工类虚拟实验则大多还停留在器材库不能由用户扩充、器材不能由用户修改的阶段。

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The National Library in Prague's Klementinum sustained damage to its electrical and heating systems.

UNESCO: Communication et information