Elinvar is a trademark for a kind of nickel-chromium steel used for watch springs because its elasticity is constant over a wide range of temperatures.
林瓦是一种用于手表弹簧的镍铬钢,因其能在很的温度范围内保持一定的弹。
Elinvar is a trademark for a kind of nickel-chromium steel used for watch springs because its elasticity is constant over a wide range of temperatures.
林瓦是一种用于手表弹簧的镍铬钢,因其能在很的温度范围内保持一定的弹。
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