单选题：Why couldn't the radiation belt be found earlier?

题目分类：专四
题目类型：单选题
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题目内容：

Why couldn't the radiation belt be found earlier? A．Because visual angles are differen
B．Because spacecrafts didn't approach Saturn close enough in the pas
C．Because viewing spot matter
D．Because the spacecraft had no imaging magnetometer advanced enough in the pas

参考答案：

答案解析：

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分类：专四题型：单选题

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分类：专四题型：单选题

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分类：专四题型：单选题