Tropical rain forests average about how many inches of rain a year?

Rainforests are subject to heavy rainfall, at least 80 inches (2,000 mm) — and in some areas over 430 inches (10,920 mm) — of rain each year. In equatorial regions, rainfall may be year round without apparent "wet" or "dry" seasons, although manyforests do have seasonal rains.

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Some connecting rods have to lubricate the cylinder wall or piston pin. the answer is letter d. graphite coating can be a major  additive to many  coating  systems and things such as connecting rods.  it functions as a refractory, lubricant, thermal conductor, and electrical conductor for a machine or thing to enhance its work.