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【单选题】
低碳钢所受到的拉应力( )时,开始出现明显的塑性变形。A.
>σb
B.
C.
达到σs
D.
达到σb
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举一反三
【单选题】Mike pretended ___ Chinese when I came into the classroom.
A.
to reading
B.
reading
C.
to be reading
D.
to be read
【单选题】When I came into the classroom, I saw some girls _______ happily.
A.
cry
B.
talk
C.
to run
D.
laughing
【简答题】She (clean) the window when I came into the classroom.
【单选题】Our English teacher the lesson when I came into the office.
A.
prepare
B.
was preparing
C.
was prepared
D.
was prepared to
【单选题】When I came into the classroom, I saw Jack _____ something on the the blackboard. [ ]
A.
is writing
B.
was writing
C.
to write
D.
writing
【简答题】( )是车站公共区的通风空调系统;( )是车站设备及管理用房的通风空调系统;( )是提供冷源的。
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