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单选题
289. The purpose of the CSD is to convert the variable speed of the engine to a constant speed for the driven of the generator to produce AC power at constant frequency
A
The purpose of the CSD is to contain the variable speed of the engine to a flexible speed for the driven of the rectifier to produce AC power at flexible frequency.
B
The function of the CSD is to transform the variable speed of the engine to a constant speed, in order to actuate the generator to generate AC power at constant frequency.
C
The purpose of the CSD is to convert the various speed of the engine to a single speed for the driven of the generator to reduce AC power to a constant frequency.
答案解析
正确答案：B
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