安全检测检验机构必须取得国家安全监管总局认可的安全生产检测检验资质，并在批准的业务范围内开展劳动防护用品检测检验工作。
参考答案：对
在面向对象方法中，类的实例称为______。
— How about the book you are reading?
— Good indeed.It______ many problems we have come across in our study.[ ]
A. says
B. talks
C. covers
D. refers
