A、波段 B、聲道 C、幅度 D、時(shí)間間隔
A、DVD-RW B、CD-RW C、CD-R D、CD-ROM
A、B2C(business-to-consumer)、B2B(business-to-business) B、B2C(business-to-consumer)、C2C(consumer-to-consumer) C、P2B(person-to-business)、C2C(consumer-to-consumer) D、P2B(person-to-business)、B2B(business-to-business)