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HCF74HC4538BEY HCF74HC4094BEY HCF74HC4060BEY HCF74HC4017BEY
HCF74HC4060BEY HCF74HC4017BEY HCF4520M1013TR HCF4518BM01
计数器 CD74HC390E HCF4017BEY HEF4060BP