单项选择题
A.diminishing the height of the seas B.lengthening the distance between successive crests C.increasing the height of the seas D.preventing the wave crests from breaking
A.contains high quantities of hydrogen sulfide B.is diluted with other products for carriage C.is lighter than other crudes D.is less hazardous to load than other crudes
A.keep the propeller from being fouled B.increase propeller speed C.help calm the waves in the vicinity of the craft D.increase the holding power of the sea anchor