试题与答案

某工程双代号时标网络计划如下图所示,其中工作A的总时差和自由时差()周。 A.均为1

题型:单项选择题

题目:

某工程双代号时标网络计划如下图所示,其中工作A的总时差和自由时差()周。

A.均为1

B.分别为2和1

C.分别为4和1

D.均为4

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析: 在补体参与的溶血试验中,如CH50和补体结合试验,均使用2U的溶血素(实验前以最高稀释度的溶血素仍能产生完全溶血的浓度确定为一个单位)。

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