By the time charter，a Shipowner agrees to place his vessel at the disposal of a Charterer for （）.

The ash content of a fuel oil is significant to the operating engineer because it （）

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The oil sludge is burnt in the （）on board I’ll show you the ashes.

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Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）

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