单选题：Which of the following statements is NOT true of the device，

题目分类：理工类
题目类型：单选题
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题目内容：

Which of the following statements is NOT true of the device，according to Paragraph 47 A．it is filled in with gravel
B．it consists of a steel pip
C．It is dropped into a borehole filled with gravel
D．it is connected to a sensor on the surface

参考答案：

答案解析：

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