This hiking backpack has 50L storage space, dimension is 12*14*23 inch. With multi-compartment design includes one main zipped compartment, one zipped front pockets and two side mesh pockets, one laptop pocket in the main compartment, one mesh pocket in t
The gasoline training equipment adopts electronically controlled gasoline engine assembly, really show the structure and principle of car EFI gasoline engine and its working process, it It can start operation, and carry out the actual operation of startin