2.题二图所示为搜索式超外差接收机原理图,其侦察频段为f口f2=10002000MH,中放带宽为4,=2MH。现有载频为1200M,脉冲为lμs的常规雷达脉冲进入接收机 (1)画出频率显示器上画面及信号波形,说明波形包络及宽度与哪些因素有关? (2)中频频率f及本振频率f应取多大,为什么? (3)画出接收机各部分频率关系图

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一、定义: 1、凡以泻下药为主组成, 2、有通导大便、排除胃肠积滞、荡涤实热攻逐水饮、寒积等作用 3、治疗里实证的方剂 二、立法依据: 《素问·阴阳应象大论》“其下者,引而竭之;中满者,泻之于内

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第一章导论 一、名词解释: 1对外贸易额 2转口贸易 3过境贸易 4无形贸易 5易货贸易