A.litmus paper
B.combustible gas indicator
C.oxygen breathing apparatus
D.oxygen indicator
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A.longitudinally
B.vertically
C.transversely
D.intermittently
A.between sunset and sunrise
B.only between 8 AM and 4 PM
C.during daylight hours in any visibility
D.during daylight hours in unrestricted visibility only
A.one zone to the east
B.one zone to the west
C.two zones to the east
D.two zones to the west
A.left in the sunlight
B.stowed wet
C.washed with soap
D.folded frequently
A.westerly
B.parallel to the isobars in the warm sector
C.toward the nearest high pressure area
D.faster than the accompanying cold front
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Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.
Class I and II private aids to navigation in or along navigable waters of the United States are listed in the（）.
Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.
Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.
Compared to a low pressure system，generally the air in a high is（）.
Consideration should be given in planning for the mooring orientation in a new location so that in adverse weather a crane is available to off-load the supply vessel on what side of the unit?（）
Dacron sails，when not in use，may be damaged if（）.
Denebola is found in what constellation?（）
Coiling new rope against the lay，bringing the lower end up through the center of the coil，then coiling with the lay，in order to remove the kinks，is known as（）.
Control of fire should be addressed（）.