消除铸件,焊接件及机加工件残余内应力,应在精加工或淬火前进行的退火方式是()
A.扩散退火
B.去应力退火
C.球化退火
D.完全退火
参考答案:B
酿制酒酿时,各种器具在使用前必须认真清洗,其目的是______.
John may phone tonight,I don't want to go out ______ he phones.
A.in case
B.in that case
C.so that
D.in time