单项选择题
A.4% B.2% C.1.5% D.1.3%
A.30kW B.25kW C.15kW D.不确定
A.90% B.80% C.70% D.50%
A.变极电动机调速 B.电磁调速电动机调速 C.调压调速 D.液力耦合器调速
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