Before replacing a piston you should check the rings to see that all clearances and gaps are （） the permissible tolerances.

Avast majority of functional gages are made to check _________ tolerances. A: position B: runout C: circularity D: flatness

Shell-mold casting can produce many types of castings with close dimensional tolerances and good surface finish at low cost.

What of the following are indicated in assembly drawings？（ ） A: Surface roughnesses of parts B: Assembling relationships of parts C: Geometrical tolerances of parts D: Working principle of assembly