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【单选题】
如果实数a与b互为相反数，则a、b满足的关系为（ ）A.
ab=1
B.
ab=-1
C.
a+b=0
D.
a-b=0
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【单选题】You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes latter, the contact is 8 miles directly astern of you. What is the estimated speed of the contac...
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