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

Which of the following is true according to this passage

A．Technology will always increase.
B．Buildings will be built taller.
C．Accurate standards will remain important.
D．Scientists and engineers will be more important.

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