产品质量审核的作用有哪些？

A. the master should be immediately informed
B. the master will be prohibited from contacting the Administration or other organization
C. he will carry out the inspection after the master be informed and be ready
D. he will carry out the inspection without informing the master

A. 断电器触电的闭合角
B. 发动机转速
C. B都正确
D. B都不正确

A. 2；
B. 3；
C. 4；
D. 5。