The most critical part of the bunkering operations, which can result in an oil spill, is when the （）<br>A:hose joints are made up<br>B:tanks are being topped off<br>C:system is being lined up<br>D:pumping operation is first started

The most critical part of the bunkering operations, which can result in an oil spill, is when the （）
A:hose joints are made up
B:tanks are being topped off
C:system is being lined up
D:pumping operation is first started

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