A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.

A.seawater contamination
B.frequent surface blows
C.dissolved oxygen deaeration
D.frequent bottom blows

A.total dissolved solids
B.salt contamination
C.water hardness
D.chlorine contamination

A.reduce mean effective pressure
B.decrease average compression pressure
C.decrease air charge density
D.increase power output