13. The ________ containing liquids such as fuel, water, slops, ballast and various bilges should be noted.
(A) flowing speed
(B) levels of tank
(C) locations
(D) machines

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統計： A(5), B(58), C(7), D(3), E(0) #3674129

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#7127101
正確答案是 (B) levels of...
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