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【单选题】
具有交替长链（如…一CH=CH-CH=CH-CH=CH一…）的高分子有可能成为导电塑料，2000年化学奖即授予开辟此领域的3位科学家．下列高分子中，可能成为导电塑料的是（ ）A.
聚乙烯
B.
聚氯乙烯
C.
聚苯乙烯
D.
聚乙炔
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举一反三
【单选题】“Have you seen Ann at the concert?”“No, but she said she would come,?”()
A.
didn’t she
B.
wouldn’t she
C.
did she
D.
would she
【单选题】— Have you seen Shirley since she moved away? — Yes. I’ve seen her several times. She comes back to visit us ______.
A.
at any moment
B.
from time to time
C.
in no time
D.
sooner or later
【简答题】A．She has already seen the movie B．She doesn't like to go to the movies C．She hasn't seen Mary recently D．Mary didn't ask her to go to the movies
【简答题】基带同轴电缆,其特性阻抗为____欧姆,其金属网状织物屏蔽层材料通常为铜,主要用于__________。 宽带同轴电缆,其特性阻抗为____欧姆,其金属网状织物屏蔽层材料通常为___,主要应用于计算机网络。
【单选题】She told them where she ______ her son.
A.
has last seen
B.
had last seen
C.
last seen
D.
was last seeing
【单选题】She stared at the painting,wonder where she ____it.
A.
saw
B.
has seen
C.
sees
D.
had seen
【简答题】A.She agrees with the man. B.She hasnt seen Kevin recently. C.She thinks Kevin will be late. D.She doesnt know what the man means.
【单选题】“狮子国,东晋时通焉,天竺旁国也。在西海之中,延袤二千余里。多出奇宝。其地和适,无冬夏之异。五谷随人所种,不须时节。其国旧无人,止有鬼神及龙居之。诸国商贾来共市易,鬼神不见其形,但出珍宝,明其所堪价,商人依价取之。诸国人闻其土乐,因此竞至,或有停住者,遂成大国。能驯养神狮子,遂以为名。风俗与婆罗门同,而尤敬佛法。安帝义熙初,遣使献玉佛像,高四尺二寸,玉色洁润,形制殊特,殆非人工,历晋、宋代,在建康...
A.
《史通·编次》
B.
《通典·边防》
C.
《隋书·经籍志》
D.
《帝王略论》
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