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【单选题】
以下关于位错说法正确的是_______?A.
刃位错的位错线是与矢量相垂直的,只能是直线.
B.
螺型位错的位错线只能是直线
C.
螺型位错位错线与向相垂直.
D.
螺型位错的位错线是螺旋形的曲线
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【单选题】How did 'improvisation' come into being?
A.
The blues singers gathered to have contests.
B.
New words were added into old songs.
C.
New styles were played with guitars.
D.
The blues singers created music while playing.
【单选题】"But the blues did occasionally afflict all the adults." Which one is its best paraphrase?
A.
But the blue color did occasionally impress all the adults.
B.
But the blues music did occasionally impress all the adults.
C.
But sadness did occasionally come to all the adults.
D.
But sadness did occasionally make all the adults feel painful.
【单选题】But the blues did occasionally afflict all the adults.
A.
feeling of deep sadness
B.
the color of the sky
C.
sad; depressed
【单选题】Blues Starting my own section of blues recommendations fills me with a creeping sense of guilt andcomplicity．Why?Because Im a white guy writing about an almost completely black genreblack，at least in ...
A.
the whites
B.
the blacks
C.
the Europeans
D.
the African people
【简答题】Where did the blues first develop?
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