130.CSD[constant-speed drive]is a component used with either aircraft gas turbine or reciprocating engines to drive AC generator,which the speed of the output shaft of the CSD is held constant while the speed of its input shalf varies ( )

　the speed of the output shaft of the CSD is constant no matter if the speed of its input changes.

　the speed of the output shaft of the CSD varies no matter if the speed of its input keeps constant.

　the speed of the output shaft of the CSD is constant only if the speed of its input remains the same.

正确答案：A

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