烧成过程中出现的液相其何作用？

An instrument that indicates wind direction is known as a(n)（）.

A. weather vane，wind vane or wind sock
B. hydrometer
C. hygrometer
D. sling psychrometer

At 1920，the buoy forward of your starboard beam is（）.

A. an interrupted quick flashing buoy
B. Hog Island Lighted Bell Buoy
C. South Light Buoy
D. Sand Shoal Inlet Lighted Buoy "A&quot

At 1810，a red buoy bears 010° relative. This buoy marks（）.

A. the side of York Spit Channel
B. the visibility limit of the red sector of Cape Henry Light
C. a submerged obstruction in York Spit Channel
D. the York River Entrance Channel

As compared to carbon dioxide，dry chemical has which advantage?（）

A. Cleaner
B. Effective on metal fires
C. Greater range
D. More cooling effect