安全阀是锅炉上的重要安全附件之一,它对锅炉( )极限值的控制及对锅炉的安全保护起着重要的作用。
A.介质成分B.内部温度C.内部压力D.介质流量
参考答案:C
Compared with the generation of our grandparents, who grew up in an age when people were lack of almost every kind of materials, we should be content with the ____ supply.
A.abundant
B.apparent
C.absurd
D.academic
安全阀的定压值是如何规定的?