belt wear is aggravated and relatively minor tears or punctures can rapidly be enlarged until the entire belt is destroyed. Trailers also can cause damage to the conveyor structure, the operating mechanism or adjacent machinery. A badly damaged or completely broken belt can act like a giant whip...
A.damaged B.ruined C.spoiled D.destroyed(4)Only a few journalists ___ the story,which was about the president.A.dared covered B.dare covered C.date to cover D.dared to cover(5)According to the research,big companies often delay ___ their bills.A.paying B.to pay C.having paid D....