bottom dead center

名词 n.
中文释义

英文释义

名词 n.
  1. A position in the cycle of a piston engine wherein the piston is at the bottommost point in its stroke. In a four-stroke cycle, BDC occurs twice: at the end of the intake stroke and at the end of the power stroke. uncountable
  2. The reference mark on a flywheel (and engine block) indicating that the engine is in this position, when aligned. uncountable
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