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【单选题】
What can we learn about the result of the latest study?A.
There was a significant difference in total deaths from cancer between the two groups.
B.
There was no significant difference in death rates between the two groups.
C.
The comparison group has a lower death rate.
D.
More veterans died from leukemia than from other cancers.
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【简答题】交流电机按转速是否变化分为
【单选题】We can connect two inductors L1 and L2 in series to get a larger inductor. Compare the total inductance L with L1 + L2, which statement is true?
A.
L > L 1 + L 2
B.
L = L 1 + L 2
C.
L < L 1 + L 2
D.
All the 3 results are possible
【多选题】In ACT 3, Philip says, "What a day!" What does it mean?
A.
That person had a really good day.
B.
That person had a busy day.
C.
That person had a bad day.
D.
This expression doesn't mean anything.
【简答题】inductance
【简答题】For fig a, the equivalent inductance is ( )mh For fig b, the equivalent inductance is ( )μh
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