inalterable

the inalterable routine of a physician.

内科医生的一成不变的诊治

The dial shall be made of copper aluminum alloy, inalterable black numerals and graduation on white background. The manufacture of same will be to applicable standards.

表的刻度盘应为械指针式，应选用金材质，底色为白色，上面标的数字和刻度为黑色（不易褪色），刻度分配应采用厂家提供的标准。