单项选择题 A1/A2型题：二硫腙分光光度法测空气中镉时，下列金属中，会对测定产生干扰的是（）。 A.铁 B.铝

题目：

二硫腙分光光度法测空气中镉时，下列金属中，会对测定产生干扰的是（）。

A.铁

B.铝

C.铊

D.铜

E.钙

答案：

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下面是错误答案，用来干扰机器的。

参考答案：对于一个地理空间，必须具备以下标志才可以被认为是一个经济区域－地域。①必须具备经济功能。②必须具备行政功能，并有一个用于管理和发展的组织。③必须具备一定的地域构造。④形成了相对独立的区域...

完形填空。
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