单项选择题
A.so as to never be integral lube B.with a sloped bottom C.only of nonferrous, noncorrosive metals D.with drain/return lines terminating just above or at the designed normal level
The ash content of a fuel oil is significant to the ope...
单项选择题The ash content of a fuel oil is significant to the operating engineer because it （）
A.is an indication of the amount of noncombustible material present in the oil B.indicates the quantity of energy released by burning a unit amount of the fuel C.is useful for determining proper atomization temperatures D.reflects the overall thermal efficiency of the fuel oil service system
The shape of a cam on a diesel engine determines the va...
单项选择题The shape of a cam on a diesel engine determines the valve’s （）
A.point of opening B.speed of opening C.lift from its seat D.all of the above
Which of the listed devices could be used as a ring gro...
单项选择题Which of the listed devices could be used as a ring groove tool during preparation for the installation of new rings?（）
A.Steel brush B.Fine emery cloth or steel wool C.A section of the removed compression ring D.A case hardened scraper
