【单选题】【消耗次数：1】
与Ⅱ型超敏反应无关的成分是（ ）
①
IgG或IgM类抗体
②
补体系统
③
巨噬细胞
④
NK细胞
⑤
CD4<sup>+</sup> 效应Th1细胞
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CD4<sup>+</sup> 效应Th1细胞通过下列哪种作用产生免疫效应（ ）
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分泌抗体
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集合A={a,b,c}，A上的二元关系R={<a,a><A,A>,<B,B>,<A,C><b,b><a,c>}，则R具有以下性质（）。</a,c></b,b></a,a>
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