Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, ______ to a maximum as the piston approaches top or bottom dead center and then ______ back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.

题目介绍: Becausethetopoftheconnectingrodswingsaboutthepinandchangesdirectioneach timethepistonreachesmid-stroketherelativespeedbetweenbearingandpinat mid-strokeiszero______toamaximumasthepistonapproachestoporbottomdeadcenter andthen______backtozeroagainasthepistonapproachesmid-strokeandtheconnecting rodchangesdirection., accelerates / decelerates?accelerates / accelerates?decelerates / decelerates?decelerates / accelerates? 本题为最佳选择题收录于二管轮题库中。