What can we infer from this passage? According to this passage, which is not used for determining the load of a steel beam?

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问题 What can we infer from this passage?
According to this passage, which is not used for determining the load of a steel beam?

选项 A、Microscopic measuring devices.
B、Machines that create large amounts of stress.
C、Machines that can measure force.
D、Analysis of the weight of the beam.

答案D

解析
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