单项选择题

According to this passage, which is not used for determining the load of a steel beam

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.
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单项选择题
According to the passage, the first phenomenon to contribute to 'the formation of the Grand Canyon was ______.
A．a series of volcanic eruptions
B．the collapse of rock formations in the Colorado Plateau
C．a succession of floods from the Hualapai River and what is now the Colorado River
D．the earth's internal pressure lifting the Colorado Plateau region
单项选择题
According to this passage, the standardized measurements were first used ______.
A．when the steel beam was developed
B．when the Egyptians built the pyramids
C．when scientists wanted to make specific observation
D．when engineers designed microscopic measuring devices
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