转速电流双闭环直流调速系统由信号给定、速度调节器、（）等组成。
A、电压调节器BC
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Ihopeyouwillspendasmuchtimeasyoucan________yourEnglish.
Heborrowedabooktheotherday，theauthor____isaworker.
Whatactually__________agoodangle—oragoodselfieoverall—isrootedinwhatweconsiderbeautiful.
Humanbeingsaresuperiortoanimals_____theycanuselanguageasatooltocommunicate.
Whentheideaofwinninginsportsiscarriedtoexcess,____competitioncanturnintodisorderandviolence.
