单项选择题
A large metallic device，mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)，designed to prevent the passage of a rapidly moving flame through the piping is called a（）.
A.flame arrestor
B.flame screen
C.detonation arrestor
D.detonation blocker
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A large basin cut into the shore，closed off by a caisson，and used for dry docking of ships is known as a（）.
A.slipway
B.graving dock
C.ground warp
D.caisson dock -
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A jack-up drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound（）.
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 -
单项选择题
A jack-up drilling rig being towed must（）.
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
