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單項選擇題

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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單項選擇題

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

單項選擇題

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