CRH5A动车组塞拉门“开启” 和“关闭” 的直接行使机构是（ ）？
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Measurement is the comparison of the unknown quantity with (). 译:测量是将未知量与什么进行比较的过程?
A. known quantity
B. a ruler
C. a scale
D. a unit
Which is NOT the objectives of metrology? 译:下列哪项不是技术测量的对象?
A. length
B. voltage
C. art
D. brightness
What’s the purpose of metrology?. 译：技术测量的目的是什么？
A. describing things
B. making things
C. quality control
D. all of the options(全部选项均正确)
What's the meaning of “metrology”?
A. something extremely large
B. science of measurement
C. a unit of length
D. none of the options(无正确选项)
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