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【单选题】
高聚物流体是一种兼有粘性和弹性的液体 . 特别是当分子量大 , 外力作用时间短或速度很快 , 温度在熔点以上不多时 , 弹性效应显著。下面哪种效应不属于高聚物流体的弹性效应 ( ) 。A.
挤出胀大效应
B.
爬杆效应
C.
不稳定流动现象
D.
高黏度
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A.
To visit friends.
B.
To give concerts.
C.
To vacation,
D.
To give private lessons.
【单选题】America will never again have as a nation the spirit of adventure as it __________ before the West was settled.
A.
could
B.
did
C.
would
D.
was
【单选题】For I have sworn before you and Almighty God the same solemn oath our forebears prescribed nearly a century and three-quarters ago.
A.
order or direct
B.
produce
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protect
D.
agree
【单选题】-I have finished the task . How about you? -We haven’t finished ours .
A.
yet; yet
B.
already; ever
C.
before; already
D.
already; yet
【单选题】For I have sworn before you and Almighty God the same solemn oath our forebears prescribed nearly a century and three-quarters ago.
A.
ancestors
B.
heirs
C.
antecedents
D.
foremen
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