单项选择题
A.1000r/min B.850r/min C.700r/min D.600r/min
A.1000r/min B.1100r/min C.1300r/min D.1500r/min
A.DC670A/AC450A B.DC670A/AC425A C.DC630A/AC425A D.DC630A/AC400A
A.DC750V/AC500V B.DC750V/AC550V C.DC650V/AC500V D.DC650V/AC450V
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