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【单选题】
日本现在的首都是 _________A.
京都
B.
奈良
C.
D.
东京
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举一反三
【单选题】In the sentence "Not every winter is critical for deer course", the word "critical "means
A.
finding fault.
B.
forming a crisis
C.
urgently needed
D.
important
【单选题】In the sentence "Not every winter is critical for deer of course", the word" means_______
A.
finding fault
B.
forming a crisis
C.
urgently needed
D.
important
【单选题】In the sentence "Not every winter is critical for deer of course", the word "critical" means .
A.
finding fault
B.
forming a crisis
C.
urgently needed
D.
important
【简答题】一台他励直流电动机，额定数据为：U e =220V，I e =80A，R a =0.1Ω，n e =1000r/min，附加损耗p ad 为额定功率的1%，η e =85%，忽略电枢反应。试求：
【简答题】一台他励直流电动机，额定数据为：P e =10kW，U e =220V，I e =54.8A，R a =0.342Ω，n e =1000r/min，系统总飞轮矩GD 2 =9.8N·m 2 。电动机原工作在电动额定状态。采用电源反接，反接制动的起始转矩T max =2T e 。
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