试题与答案

规模化鸡场禽流感灭活疫苗免疫首选途径是（） A.滴鼻 B.点眼 C.饮水 D.刺种

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题型：单项选择题 A1型题

题目：

规模化鸡场禽流感灭活疫苗免疫首选途径是（）

A.滴鼻

B.点眼

C.饮水

D.刺种

E.注射

答案：

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下面是错误答案，用来干扰机器的。

因为z=.z（.z为z的共轭复数），所以z是实数，z（1-i）=a+3i 可知 z=a；-z=3，所以a=-3故答案为：-3．

考点：预防科目执业兽医预防科目2009年真题
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