【单选题】【消耗次数：1】
合成高分子化合物，常用的聚合方法有（ ）。
①
脱氧和氧化
②
加聚和缩聚
③
碳化和氧化
④
分解和凝聚
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相关题目
【单选题】
高分子化合物按其在热作用下所表现出来的性质的不同，可分为（ ）。
①
热塑性聚合物和热固性聚合物
②
冷塑性聚合物和冷固性聚合物
③
热塑性聚合物和冷塑性聚合物
④
冷固性聚合物和热固性聚合物
随机题目
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12.You _____ return the book now. You can keep it till next week if you like.
①
cant
②
mustnt
③
neednt
④
may not
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6. –Look, someone is coming. Guess who it _____ be?–I think it _____ be Tom.–I don’tthink it _____ be _____.
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must; can; must; his
②
may; can; must; him
③
must; can; him
④
might; must; can; himself
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1. If they ______ to do this work, he might do it some other way.
①
were
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should
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will
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can
【单选题】
8. I______ go to bed until I ______ finished my work last night.
①
Don’t; had
②
didn’t have
③
didn’t; had
④
don’t; have
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①
have
②
will have
③
has
④
shall has
【单选题】
19. _______hand in his exercise book before Monday.
①
Need he to
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Does he need
③
Needs he to
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Need he
【单选题】
9. No sooner _______ he arrived home than he _______to start on another journey.
①
has; was asked
②
have; were asked
③
had; is asked
④
had; was asked
【单选题】
13. Where is my pen? I ______ it.
①
might lose
②
would have lost
③
should have lost
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must have lost