before start the ENGINE, building site WARNING : Before working, please check around carefully,does any unsafe things come out or something working unnormal.do your best let the working place's land hard and levelling<smooth> before you working on it.if dust so big on your working place, please watering the land before you working on it. If your working near by the street, there must have someone direct the transportation,or put fence over around and post on it,write "DO NOT ENTER"<"stuff only">,do it for protecting someone walking on the street or driving cars passing.If your working place buriied facilities,like water pipeline,gas pipeline,high voltage pipeline, you must contact there company, for sure where this facilities exactly buried. And when you working,do not distroy them. If you working underwater or pass the sandy embankment, first of all you must check on the ground,check depth of water and check the speed of water<stream velocity>.Do not over the safety depth. --------------finish------------------------------- if something uncertainty, send email to [email protected] will check it immediately..