If the arc generated during the make or brake of electrodes of spark-test apparatus was regarded as a non-linear resistance, non-explosion assessing intrinsic safety method can be established.

Using MR fluids in recoil brake of gun, the damping can be regulated by means of changing consistence of MR fluids to form hydraulic resistance, and law of recoil resistance can also be controled.

At present, the air conditioner compressor are the main export items, followed by electronic brake system, slide resistance system, axles and lamps.