词语countdown
解释计数损失,脉冲分频
词性名词
countdown〔名词〕递减计数(回答脉冲比,询问无效率)详细»
countdown〔名词〕用倒数式计时详细»
countdown〔名词〕计数损失详细»
countdown【林】(从飞机上投放灭火药剂的命令的)倒计数详细»