Moving cowl, decreasing interior contraction ratio also can realize the hypersonic sidewall compression inlet's self-starting because of separation bubble on sidewall spilling out.

Efficiency: Powerfully enhance the contraction and elasticity of pores, vertically float dissolved comedones, moisturize skin, strengthen the self-repairing ability of pores;

The self-compensated contraction caused by graphite dilatation in the solidification process of nodular cast iron makes casting with less flow-off or casting without flow-off possible.