单项选择题

Image clarity on a computer screen is measured with ( ).

A.screen
B.dot
C.resolution
D.color
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单项选择题
The generator voltages are usually stepped up to the transmission voltage level by ( ).
A.series
B.parallel
C.step-up
D.step-down
单项选择题
The objective of the optimal economic operation of power systems is ( ).
A.to
B.to
C.to
D.to
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