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【简答题】
能耗制动的优点是制动平稳、准确,对机械传动装置的冲击 (填大或小),而且能量消耗 (填多或少);缺点是需要附加直流电源,设备成本较高,制动力较弱,特别在低速时制动力矩小。
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举一反三
【单选题】Short conversation 1
A.
Run five miles a week
B.
Do whatever she can to exercise
C.
Walk for 10 minutes after dinner
D.
Bike for an hour every day
【单选题】Short conversation 1
A.
He has too many dreams.
B.
He likes to sleep.
C.
He doesn't put his ideas into practice.
D.
He doesn't have very many ideas.
【简答题】short conversation 1
【单选题】Short conversation 1
A.
Bob remembered all his lines.
B.
Bob performed very naturally.
C.
Bob should have performed better.
D.
Bob should be proud of himself.
【单选题】Short conversation 1
A.
As a hero.
B.
As a thief.
C.
As a role-model.
D.
As a hero who is bad.
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