A screw-shaped camshaft is a type of mechanical variable valve actuation system ( VVA ) .
A helical camshaft is a type of mechanical variable valve actuation ( VVA ) system .
A helical camshaft is a type of mechanical variable valve actuation ( VVA ) system .
このテキストを言い換えてください: A screw-shaped camshaft is a type of mechanical variable valve actuation system ( VVA ) . 出力: