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【判断题】
低温焊后热处理是指加热温度在300℃以下的热处理。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】柴油机由机体组、()机构、() 机构、()系、()系、()系、起动系及进排气系组成。
【单选题】The ' nurture' theory tries to explain _
A.
it is our environment not biologically based instincts that determines how we will act
B.
human beings are completely shaped by their surroundings
C.
environment is more important than biological and genetic factors in shaping one' s behaviors
D.
one acts because he has to adapt himself to the environment
【单选题】Our theory is based on the simple _________ that communication always involves two parties.
A.
dilemma
B.
inclination
C.
premise
D.
inspiration
【简答题】在三系制种中由不育系和保持系组成()，不育系和恢复系组成()。
【简答题】“两区三系”制种法使用了______系、______系和______系。
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