A.flame arrestor
B.flame screen
C.detonation arrestor
D.detonation blocker
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A.slipway
B.graving dock
C.ground warp
D.caisson dock
A.a 2-second blast every 20 seconds
B.a 4-second blast every 20 seconds
C.an 8-second blast every 30 seconds
D.a 10-second blast every 30 seconds
A.turn off all lights that interfere with the navigation lights
B.turn on all available working lights on deck
C.ring the bell rapidly for five seconds once a minute
D.display two black diamonds in a vertical line during the day
A.Aye Aye Sir
B.Right 15 degrees rudder
C.Rudder is right 15 degrees
D.No reply is necessary，just carry out the order
A.heavy-walled drill pipe
B.tool joint
C.down hole tool
D.drill collar
最新試題
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（）.
A large basin cut into the shore，closed off by a caisson，and used for dry docking of ships is known as a（）.
An inert gas system on a tanker should be used to（）.
It is not necessary to declare（）in the Health List.
A fire pump may be used for other purposes if（）.
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（）.
A green buoy has a yellow triangle on it. This is a(n)（）.
A safe fuel system must（）.
A fishing vessel casualty must be reported to the Coast Guard if it involves（）.
Please supply 200 tons of fresh water（）my ship.