inalterable

1.the inalterable routine of a physician.

内科医生一成不变诊治程序

2.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.

仪表刻度盘应为械指针式，应选用铜铝合金材质，底色为白色，上面标数字和刻度为黑色（不易褪色），刻度分配应采用厂家标准。