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【单选题】
Throughout the weekend gales had lashed the countryside. They had flattened corn in the fields, blown down trees and ripped off roofs, and stories were circulating ______ships that the gales had driven aground and wrecked.A.
around
B.
for
C.
with
D.
of
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【简答题】一台他励直流电动机拖动恒转矩负载运行，额定转速n N =1500r/mm，不计空载转矩T 0 ，试在下表空格中填上有关数据。 U Φ (R a +R s )/Ω n' 0 /r·min -1 n/r·min -1 I a /A U N Φ N 0.5 1650 1500 58 U N Φ N 2.5 0.6U N Φ N 0.5 U N 0.8Φ N 0.5
【单选题】一台他励直流电动机额定电压为220V,拖动恒转矩负载稳定运行在某一转速上,电枢电流为28A,今将电压降低到110V而每极磁通保持不变,则稳定以后的电枢电流等于()
A.
14A
B.
28A
C.
56A