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219. X.X.30CAD drawings drawn for Tianzheng 6 and above versions need to be saved in the old version (command: LCJB) and saved in T3 format before being imported into Sketchup for editing. Otherwise, entities such as walls, columns, doors and windows will not be imported into Sketchup.但是哪想，这个练霓裳还没有出来，威势就盖过诸多大盗。(a) did not set up a technical person in charge, clear project person in charge;I nodded at this passage, Understand that what Zhang Xiaobo said is indeed reasonable, It is not a lie, Here I think it is necessary to give you one thing about popular science. So we have to say something digressive: The result of a real bullet hitting a petrol tank is not the same as that shown in most movies. One shot can explode the petrol tank, But this is not the case, Although a pure metal projectile will rub against the air at a speed of hundreds of meters per second to generate equivalent heat, And will produce sparks after hitting the metal oil drum, But none of this is enough to ignite petrol, Especially for gasoline with a large total amount, to ignite gasoline, please remember one thing-open flame must be used. In addition, gasoline is a flammable item, but it is not an explosive item in the true sense. Only after reaching a certain total amount can explosion be caused. If the total amount is insufficient, it can only cause combustion without explosion.Still use the-I option to insert rules,-I INPUT 2 means to add rules in the INPUT chain, and the number of the added rules is 2. OK, try it yourself.