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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1.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
2.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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