イ DRAM DRAMは主記憶（メインメモリ）として使われるメモリで、電源を切るとデータが消えます。これは揮発性メモリと呼ばれます。 PCのメインメモリ プログラムを動かすときに一時的に使われます。 例：アプリを開いているときの作業用メモリ DRAM is used as the main memory in a PC, and its data is lost when the power is turned off. This is called volatile memory. It is used as the main memory of a PC and temporarily stores data while programs are running. Example: working memory used when applications are open.
ウ ROM ROMも電源を切ってもデータは消えません。 PCの起動プログラムを保存しています。 電源を入れたときの最初の処理に使われます。 例：BIOS、ファームウェア
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