The piston is fitted with _____piston rings.
A: four
B: three
C: two
D: one
A: four
B: three
C: two
D: one
举一反三
- Among the rings of a piston the （） one is subjected to the greatest load and temperature.
- The sealing rings are in four parts and pressed together around the piston rods by means of （）.
- 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.
- 纽约步的节拍是（ ） 。 A: two and three and four one B: one two three four and one C: one two three four D: two and three four one
- The piston rings are manufactured with a diameter （） the bore of the cylinder.