Elinvar is a trademark for a kind of nickel-chromium steel used for watch springs because its elasticity is constant ove埃林瓦是一种用于手表弹簧的镍铬钢，因其能在很大的温度范围内保持一定的弹性。
For the oxidase test use a loop or a needle made of platinum-iridium or a glass needle (or a sterile wooden toothpick) b氧化酶试验应使用白金环或针，或玻璃针（或无菌的木制牙签），但不要用镍铬环或金属丝以免引起假阳性。