The piston rings are manufactured with a diameter （） the bore of the cylinder.
举一反三
- 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.
- The lower end of each piston rod is reduced in diameter to fit a bore in （）， this being secured to the piston rod by a nut.
- All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.
- Block group contains______. A: connecting rods,crankshaft and flywheel B: pistons,connecting rods and oil pan C: cylinder block,cylinder head and oil pan D: piston rings,gasket and connecting rods
- These piston rings are so badly worn that they must be （）.