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【单选题】
食品保鲜膜按材质分为聚乙烯（PE）、聚氯乙烯（PVC）、聚偏二氯乙烯（PVDC）等种类．PVC被广泛用于食品、蔬菜的外包装，它对人体有潜在危害．下列有关叙述不正确的是（　　）
A.
PVC保鲜膜属于链状聚合物，在加热时易熔化，能溶于氯仿
B.
PVC单体可由PE的单体与氯化氢加成制得
C.
鉴别PE和PVC，可把其放入试管中加强热，在试管口放置一湿润的蓝色石蕊试纸，如果试纸变红，则是PVC；不变红，则为PE
D.
等质量的聚乙烯和乙烯燃烧消耗的氧气相等
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【单选题】20120141下列操作中,(41)不可以将文档1.doc与2.doc的内容合并形成3.doc。
A.
先打开文档1.doc，另存为3.doc；再打开文档2.doc，另存为3.doc
B.
打开文档2.doc，将文档1.doc的内容复制到文档2.doc的首页，再另存为3.doc
C.
新建文档3.doc，再分别将文档1.doc和2.doc的内容复制在新建的文档中进行保存
D.
打开文档1.doc，将文档2.doc的内容复制到文档1.doc的尾部，再另存为3.doc
查看完整题目与答案
【简答题】I sat at the front part of the car, next _____ the driver. 2. He spoke _____ a soft, but sure and utakable voice. 3. I was also excited to be invited _____ a small family party, the wedding of Jac...
查看完整题目与答案
【简答题】At last he was able to struggle free, run to his car and call out______ help.
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【简答题】Mr Black was young and able. He worked very hard. And the boss liked him. Last month he was sent to China on business. When he got to Beijing, he visited some places of interest and felt very happy. O...
查看完整题目与答案
【单选题】At last he finish the work ahead of time.
A.
could
B.
was able to
C.
could have done
D.
would have been able to
查看完整题目与答案
【单选题】阅读短文，回答下列各题： Mr．Black was young and able．The boss liked him．Last month he was sent toChina on business．Before hewent back from China，he decided to buy something for Tony，the sonof his boss．At first he...
A.
Mr．Blackhad never been to China before．
B.
Mr．Blackwas an able and hard—working man．
C.
Mr．Blackcould buy something interesting for Tony．
查看完整题目与答案
【简答题】A. suddenly B business C. left D. same E. glad F. sad G. local Mr. Black was young and able. The boss liked him. Last month he was sent to China on 46 . Before he went back from China, he decided to b...
查看完整题目与答案
【单选题】下列操作中,(41)不可以将文档1.doc与2.doc的内容合并形成3.doc。
A.
先打开文档1.doc，另存为3.doc；再打开文档2.doc，另存为3.doc
B.
打开文档2.doc，将文档1.doc的内容复制到文档2.doc的首页，再另存为3.doc
C.
新建文档3.doc，再分别将文档1.doc和2.doc的内容复制在新建的文档中进行保存
D.
打开文档1.doc，将文档2.doc的内容复制到文档1.doc的尾部，再另存为3.doc
查看完整题目与答案
【简答题】The scientist failed many times, and at last he was able to ________ a new medicine (invention)
查看完整题目与答案
【单选题】●下列操作中， (41)可以将文档1．doc与2．doc的内容合并形成3．doc。 (41)
A.
先打开文档1．doc，另存为3．doc；再打开文档2．doc，另存为3．doc
B.
打开文档2．doc，将文档1．doc的内容复制到文档2．doc的首页，再另存为3．doc
C.
新建文档3．doc，再分别将文档1．doc和2．doc的内容复制在新建的文档中进行保存
D.
打开文档1．doc，将文档2．doc的内容复制到文档1．doc的尾部，再另存为3．doc
查看完整题目与答案
相关题目：
【单选题】20120141下列操作中,(41)不可以将文档1.doc与2.doc的内容合并形成3.doc。
A.
先打开文档1.doc，另存为3.doc；再打开文档2.doc，另存为3.doc
B.
打开文档2.doc，将文档1.doc的内容复制到文档2.doc的首页，再另存为3.doc
C.
新建文档3.doc，再分别将文档1.doc和2.doc的内容复制在新建的文档中进行保存
D.
打开文档1.doc，将文档2.doc的内容复制到文档1.doc的尾部，再另存为3.doc
查看完整题目与答案
【简答题】I sat at the front part of the car, next _____ the driver. 2. He spoke _____ a soft, but sure and utakable voice. 3. I was also excited to be invited _____ a small family party, the wedding of Jac...
查看完整题目与答案
【简答题】At last he was able to struggle free, run to his car and call out______ help.
查看完整题目与答案
【简答题】Mr Black was young and able. He worked very hard. And the boss liked him. Last month he was sent to China on business. When he got to Beijing, he visited some places of interest and felt very happy. O...
查看完整题目与答案
【单选题】At last he finish the work ahead of time.
A.
could
B.
was able to
C.
could have done
D.
would have been able to
查看完整题目与答案
【单选题】阅读短文，回答下列各题： Mr．Black was young and able．The boss liked him．Last month he was sent toChina on business．Before hewent back from China，he decided to buy something for Tony，the sonof his boss．At first he...
A.
Mr．Blackhad never been to China before．
B.
Mr．Blackwas an able and hard—working man．
C.
Mr．Blackcould buy something interesting for Tony．
查看完整题目与答案
【简答题】A. suddenly B business C. left D. same E. glad F. sad G. local Mr. Black was young and able. The boss liked him. Last month he was sent to China on 46 . Before he went back from China, he decided to b...
查看完整题目与答案
【单选题】下列操作中,(41)不可以将文档1.doc与2.doc的内容合并形成3.doc。
A.
先打开文档1.doc，另存为3.doc；再打开文档2.doc，另存为3.doc
B.
打开文档2.doc，将文档1.doc的内容复制到文档2.doc的首页，再另存为3.doc
C.
新建文档3.doc，再分别将文档1.doc和2.doc的内容复制在新建的文档中进行保存
D.
打开文档1.doc，将文档2.doc的内容复制到文档1.doc的尾部，再另存为3.doc
查看完整题目与答案
【简答题】The scientist failed many times, and at last he was able to ________ a new medicine (invention)
查看完整题目与答案
【单选题】●下列操作中， (41)可以将文档1．doc与2．doc的内容合并形成3．doc。 (41)
A.
先打开文档1．doc，另存为3．doc；再打开文档2．doc，另存为3．doc
B.
打开文档2．doc，将文档1．doc的内容复制到文档2．doc的首页，再另存为3．doc
C.
新建文档3．doc，再分别将文档1．doc和2．doc的内容复制在新建的文档中进行保存
D.
打开文档1．doc，将文档2．doc的内容复制到文档1．doc的尾部，再另存为3．doc
查看完整题目与答案
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