【名词&注释】
科技进步(scientific and technological progress)、严格执行(strict implementation)、违法行为(illegal activities)、严厉打击(severely striking)、特种设备安全(special safety equipment)、不低于(no less than)
[单选题]AK产品涂层硬度要求不低于(no less than)()
A. 1H
B. 2H
C. 3H
D. 4H