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【简答题】
他励直流电动机的 ,是 指运行中的直流电机突然断开电枢电源,然后在电枢回路串入制动电阻,使电枢绕组的惯性能量消耗在电阻上,使电机快速制动。
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举一反三
【单选题】Which of the following is TRUE?
A.
Chinese people find it very easy to learn the names of English people.
B.
English people find it very easy to learn the names of American people.
C.
Jenny finds it very easy to learn the names of students from all over the world.
D.
Any name is very difficult to learn.
【简答题】What do these stressors have in common and what can we do to cope with them?
【单选题】We often hear him ( ) English under the tree in the morning.
A.
read
B.
reading
C.
to read
D.
reads
【单选题】Which of the following is INCORRECT according to the story?
A.
Both of the parents had an enjoyable day.
B.
Both parents and children had great experiences.
C.
Both parents and children learned something about how to spend money.
D.
Both the son and daughter had spent all their money.
【多选题】What can we do to multi-task better in interpreting?
A.
To make each sub-task routine or automatic by practice
B.
To make the brain energy pool larger through great concentration
C.
To allocate brain energy more effectively
【多选题】What can we do to promote environmental protection in our daily life?
A.
Save all resources that we could save
B.
Take action to promote recycling
C.
Fight against all kinds of pollution
D.
Promote the idea to people around us
【单选题】— What can we do to help animals in nature reserves?— We can .A．keep hunters away from reservesB．
A.
— What can we do to help animals in nature reserves? — We can ____. A．keep hunters away from reserves
B.
take their babies home
C.
cut down some trees in reserves
D.
encourage farmers to grow more rice in reserves
【单选题】Expenditure increased on all the following EXCEPT______.
A.
food
B.
automobiles
C.
education
D.
entertainment
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