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【单选题】
某三相变压器的容量为 320kV·A ,额定电压为 3300/380V ,一次绕组的额定电流为 ( ) 。A.
52.5A
B.
56.0A
C.
59.5A
D.
63.0A
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B.
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A.
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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...
A.
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B.
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