A.two certificates have expired
B.two certificates will expire
C.one of the two certificates have expired
D.one of the two certificates will expire
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A.has the full force of the regular Certificate of Inspection
B.expires six months after it is issued
C.must be exchanged for a regular Certificate of Inspection within 3 months
D.is retained in the custody of the Master
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A hand held instrument used to measure distances between objects and the ship is a（）.
A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a（）.
A head-on situation at night is one in which you see dead ahead a vessel showing（）.
A fixed carbon dioxide extinguishing system for a machinery space，designed WITHOUT a stop valve in the line leading to the protected space，is actuated by（）.
Between 1830 hrs and 1850 hrs this day，strong gusty winds（）by my vessel，in consequence of which the vessel’s four mooring lines were broken.
An inert gas system on a tanker should be used to（）.
Cargo transfer operations on a tank vessel need NOT be stopped when（）.
A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.
It is not necessary to declare（）in the Health List.
A large vessel is equipped with a controllable pitch propeller. Which statement is TRUE?（）