A.8MHz B.80000MHz C.800MHz D.0.8MHz
A.磁盤軌跡大小B.磁片的軌跡C.旋轉(zhuǎn)速度D.感應(yīng)盤片上磁場(chǎng)
A.數(shù)模信號(hào)轉(zhuǎn)換B.模數(shù)信號(hào)轉(zhuǎn)換C.數(shù)模、模數(shù)的轉(zhuǎn)換D.不轉(zhuǎn)換任何信號(hào)