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【多选题】
退火的主要目的是___、___、___、___。A.
细化晶粒，组织均匀化
B.
降低钢的硬度，提高塑性，以利于切削加工及冷变形加工
C.
消除钢中的残余应力，以防止变形和开裂
D.
提高钢的强度和硬度，降低塑性
E.
为以后的热处理作准备
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【简答题】Mr. Brown wrote the words down on _________.
【单选题】The US biodefence research is particularly controversial because of the sheer ______ of the effort.
A.
latitude
B.
magnitude
C.
aptitude
D.
attitude
【简答题】In the text Got My B.A, by Sheer Luck, the author thought he got one chance in a million because
【单选题】The ordinary family in colonial North America was primarily concerned with sheer physical survival and beyond that, is own economic prosperity. Thus, children were valued in terms of their productivit...
A.
The Place of Children in United States Society
B.
The Children of Colonial North American
C.
The Development of Cultural Values
D.
The Child as a Utilitarian Organism
【单选题】I am _____, I am an English boy. [ ]
A.
John Brown
B.
Brown John
C.
Gina Green
D.
Green Gina
【简答题】John Brown wrote this essay. 改为: ?
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