试题与答案

右图示神经系统、免疫系统和内分泌系统等三大系统相互调节的部分示意图。据图回答下列问题

题型:填空题 案例分析题

题目:

右图示神经系统、免疫系统和内分泌系统等三大系统相互调节的部分示意图。据图回答下列问题:

有科研人员利用免疫调节原理将毒性弱的霍乱菌苗注入正常小鼠体内,作为()起作用,使其体内产生了相应的免疫活性物质,该过程会出现左图()(填A或B)所示的现象。

答案:

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参考答案:A解析: 固定资产折旧计提的年数总和法 年数总和法是将固定资产的原价减去预计残值后的余额乘以一个逐年递减的变动折旧率计算每年的折旧额的一种方法。固定资产的变动折旧率是以固定资产预计使用年限...

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