Meanwhile, I always kept in touch with my former professor at college.
A.kept in contact with
B.kept pace with
C.had an idea of
D.exchanged letters with
Meanwhile, I always kept in touch with my former professor at college.
A.kept in contact with
B.kept pace with
C.had an idea of
D.exchanged letters with
A.kept pace with
B.kept in contact with
C.had an idea of
D.exchanged letters with
A long solenoid is compressed to 80% of its original length (without changing the number of coils N), meanwhile the current on it changes from I to 2I. How does its magnetic energy change? From U to ________×U
W: Actually they were sent to you on Monday with the company courier. You haven't received them yet?
M: No, and I will check with the courier's office. But meanwhile, could you send them again, just to ensure that I have them by this afternoon? I really appreciate it.
W: Sure, I'll try to get them on the 9 o'clock courier run.
Who most likely are the speakers?
A.The manager and his secretary
B.Close friends in the same apartment
C.Colleagues from the company
D.Customer and postman
A.I=S+(M-X)
B.C+I+G=C+S+(T0一TR)
C.C+I+G+(T0一TR)=C+S+(M-X)
D.I=S+(T-G)十(M一X)
E.I=S+(T-G)
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