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PK-21A31P,音频指示器及警报器 PC MNT 3.0-24V
PK-21A31PQ,BUZZER PIEZO 3KHZ 24MM PC MT
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【Freescale Semiconductor】PK21DN512VMC5,ARM Microcontrollers (MCU) Low-Power Cortex-M4 PRE-QUALIFIED SAMPL