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Frequent ______ is important: fixing or changing faulty parts of the propulsion system when necessary.
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the higher fuel consumption per SHPD
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M-Eemergency operationD
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单选题Navigational charts are （） frequent changes，the important one of which are promulgated by Admiralty Notices to Mariners．A
published withB
combined withC
in connection withD
subject to
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ColumnC
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frictionC
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symptomsB
samplesC
tracesD
tracks
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