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單項選擇題

After using a C0₂ portable extinguisher,it should be（）.

A.put back in service if some CO₂ remains
B.hydrostatically tested
C.retagged
D.recharged

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單項選擇題

All dunnage planks and mats must be sent to board（）commencement of loading.

A.prior to
B.during
C.in the period of
D.afterwards

單項選擇題

All echo-sounders can measure the（）.

A.actual depth of water
B.actual depth of water below keel
C.average depth from waterline to hard bottom
D.average depth of water to soft bottom

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