单选题 A machine language is a(n) ＿＿＿＿＿＿＿ language in binary code that the computer can understand and eｘecute directly. 的答案

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题目内容：
A machine language is a(n) ＿＿＿＿＿＿＿ language in binary code that the computer can understand and eｘecute directly.
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