常見例句Mechanical propert ties.Longit tudinal and shear vibrat tion. 蓡考名稱: Met thods of test ting plast tics.Elect ric mo to rs are smaller and cleaner, and operate w ithless no ise and vibrat ion. 電動機比較小,較乾淨,而且運轉(zhuǎn)進聲音和振動較小。 返回 vibrat-