18.The“Stowage Factor”is measured by“long ton”in practice. What is the weight of one “LONG TON”？
(A)2000 1b
(B)2200 1b
(C) 2240 1b
(D)2420 1b

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統計： A(1), B(1), C(23), D(0), E(0) #1214604