hrs是什么单位?The inhibitor was added after 24 hrs pre-corrosion

hrs是什么单位?The inhibitor was added after 24 hrs pre-corrosion HRS是什么? HRS是什么钢材 24 Hrs in practice i am leaving in 8 hrs for 24 hrs? HRS怎么样? hrs是什么意思? ( )coat is hrs?The pink one. 化工中HRS是什么的缩写 LAYTIME SHALL COMMENCE COUNTING 8 HRS AFTER NOR IS TENDERED 英语翻译CXL WITHIN 24 HRS-FEE 1 NIGHT-CXL-MODIFY 24 HRS PRIOR AR 金属热处理中的硬度单位HBS/HRS/HRC是什么意思?