The lower section of a piston is called the （）.
The function of the piston compression rings used in a diesel engine is to （）
While engine is in operation the piston moves up and down, thus causing the rotation of the （）.
Which of the following will increase the positive stability of your vessel?（）.
The lower end of each piston rod is reduced in diameter to fit a bore in the （）, this being secured to the piston rod by a nut.
The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.
The piston rings are manufactured with a diameter （） the bore of the cylinder.
The main purpose of the piston oil scraper rings is to （）.
Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）
(Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）
The outside diameter of the pipe is （） the diameter of the bore of the piston rod, the result being that an annular space formed between the piston rod and the pipe.
When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its（）
The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.
The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.
The upper section of a piston is called the （）
Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）
The main function of piston compression rings is to （）
The lower end of each piston rod is reduced in diameter to fit a bore in the cross-head, this being secured to the piston rod by （）.
During working, when the piston is near the （）, the air ignites the fine spray of fuel.
Among the rings of a piston the （） one is subjected to the greatest load and temperature.
The lowest ring of a piston is （）.
Which of the following does not affect the position of the DD curve?
Which of the following statements provides the best description of the marketing concept of positioning?
Which of the following is not the outer position?
