1)main pressure differential,周压差2)periodic potential difference,周期电位差，周期电压3)differential pressure,差压，压差4)envelope to cycle difference,包周差包周差5)circumferential temperature different,周向温差6)circular pitch error,周节误差
用法和例句
To solve the problem of inline measuring hobs with bigger modulus in practice production,an inline measuring system for the circular pitch error of hobs is introduced.