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【单选题】
说明下列情况下无载电动势的变化:(1) 每极磁通减少10%,其他不变;(2) 励磁电流增大10%,其他不变;(3) 电机转速增加20%,其他不变。A.
(1)感应电动势增大10%; (2)感应电动势减小10%; (3)感应电动势增加20%
B.
(1)感应电动势减小10%; (2)感应电动势增大10%; (3)感应电动势 减小20%
C.
(1)感应电动势增大10%; (2)感应电动势增大10%; (3)感应电动势增加20%
D.
(1)感应电动势减小10%; (2)感应电动势增大10%; (3)感应电动势增加20%
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【简答题】________(free) from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunrise.
【单选题】— When does your mother go shopping? —Usually Sunday mornings.
A.
in
B.
on
C.
with
D.
at
【单选题】After ______ seemed an endless night, it was time for them to open the boxes of presents.
A.
it
B.
that
C.
what
D.
there
【单选题】Does your mother go to work by bus?
A.
Yes, she do.
B.
No, she doesn't.
C.
No, she don't.
【单选题】-How does your mother go to work? -_.
A.
On foot.
B.
On feet.
C.
With foot
D.
With feet
【单选题】My grandfather Paul Goodman ______ to my endless of music.
A.
helped
B.
dedicated
C.
committed
D.
contributed
【单选题】—_____ does your mother go to work every morning? —At eight o’clock.
A.
When
B.
Why
C.
Where
D.
How
【单选题】—How does your mother go there?
A.
______.
B.
On her bike
C.
By a train
D.
In bus
E.
Took plane
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