A snow removal agent for melting snow, consisting of magnesium chloride, halite, urea, sodium tripolyphosphate and sodium metasilicate, wherein the sodium tripolyphosphate and the sodium metasilicate each account for an identical weight percentage in the agent, wherein the halite is crushed to a size of 7-20 mm and aged for 24-48 hours. The invention deposits the GMR and lead layers before milling away the unwanted material. The control of the end user on the authorized service is ensured to the greatest extent. The whole surface of the frame shades the film, except for an opening for the film pack. Preferably, the reinforcement component is bioabsorbable as well. A first silicongermanium layer, which has a Ge concentration therein, is formed within the cavity and over the doped tub by adjusting a process parameter to induce a strain in the first SiGe layer.