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Some cranes are mounted in pairs on a common platform. which can be rotated through_____.
A.360o
B.270o
C.180o
D.90o
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单选题Which of the following statements is FALSE concerning cranes being installed on the centerline of vessels（）.A
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单选题Some cranes are mounted in pairs on a common platform which can be rotated through（）.A
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单选题（） are mounted in pairs to protect the boiler against overpressure.A
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Water tubesC
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