A.soft clayB.hard mudC.very soft mudD.sandConventional ……

单项选择题Control of fire should be addressed（）.

A.immediately after restoring vital services
B.immediately
C.following control of flooding
D.following establishment of fire boundaries

单项选择题Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.

A.prevailing westerlies
B.horse latitudes
C.trade winds
D.subpolar low pressure belts

单项选择题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?（）

A.Weather side
B.Leeward side
C.Upwind side
D.Crosswind side

单项选择题Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）

A.When at anchor，the pilot vessel is only required to sound anchor signals
B.The identification signal must be sounded any time the pilot vessel is underway
C.The pilot vessel may only sound the identity signal when making way
D.All of the above

单项选择题Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.

A.Greenwich celestial meridian
B.hour circle of the body
C.local celestial meridian
D.vertical circle of the body