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【单选题】
学生实验的注意事项包括: prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> 1实验之前,教师应该充分地做好实验的相关准备工作。 2实验开展的过程中做好实验教学的组织与指导。 3最大限度地发挥实验教学的作用。 4在实验过程中培养学生的安全观念。 5用科学的态度对待实验中所用到的实验动物及其他实验材料
A.
①②③
B.
②③④
C.
①②③④
D.
①②③④⑤
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参考答案：
举一反三
【判断题】基团O=C一H的v(C一H)出现在2720cm-1( )
A.
正确
B.
错误
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【单选题】Directions: This section is totest your ability to understand short conversations. There are 2 recordedconversations in it. After each conversation, there are some recordedquestions. Both the conversa...
A.
To his hometown
B.
To the beach
C.
To his university.
D.
To the hospital.
查看完整题目与答案
【单选题】Directions: In this section,you will hear three news reports. At the end of each news report,you will hear two or three questions. Both the news report and the questions will be spoken only once.After...
A.
1. A) There are some coffee drinkers around the world.
B.
B) Drinking coffee helps people live longer.
C.
C) People have different coffee drinking habits.
D.
D) Coffee can protect against all diseases.
查看完整题目与答案
【判断题】基团O=C-H的v(C-H)出现在2720cm-1。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Section B Directions: This section is to test your ability to understand short conversations. There are 2 recorded conversations in it. After each conversation, there are some recorded questions. Both...
A.
One.
B.
Two.
C.
There.
D.
Four.
查看完整题目与答案
【简答题】某厂利用一种天然产物进行发酵，发现发酵酒中含有U、V、W、X等多种化合物。已知： ①U和W 均可与银氨溶液反应，析出金属银，而且U是一种单糖； ②V是个单官能团化合物，其碳原子数和X相 同，V在浓硫酸作用下加热得到Y，Y可以使溴水褪色； ③V经缓和氧化可以生成W； ④V和X在少量浓硫酸作用下经加热可得到Z； ⑤X的组成为C-40%，H-6.7%，O-53.3%，X含有一个羧基，已知 450mg X...
查看完整题目与答案
【简答题】某厂利用一种天然产物进行发酵，发现发酵液中含有U、V、W、X等多种化合物。已知①U和W均可与银氨溶液反应，析出金属银，而且U是一种单糖。②V是单官能团化合物，其碳原子数和X相同。V在浓硫酸作用下经加热得Y，Y可以使溴水褪色。③V经催化氧化可生成W。④V和X在少量浓硫酸作用下经加热可以得到Z。⑤X的组成为C∶40％；H∶6.7％；O∶53.3％。X含有一个羧基，450mgX与0.20mol/L的Na...
查看完整题目与答案
【单选题】Part I (2*10=20%) Directions: In this section you will hear ten short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the questi...
A.
The first person had some fried food at home.
B.
The first person had a flat tire on the way home.
C.
The second person had a flat tire on the way home.
D.
The second person had some fried food at home.
查看完整题目与答案
【判断题】基团O-C--H 的v(C H) 出现在2720cm
A.
正确
B.
错误
查看完整题目与答案
【单选题】Part II (3*10=30%) Directions: In this section, you will hear 3 short passages. Each passage will be spoken TWICE. At the end of each passage, there will be a pause. During the pause you must read the...
A.
near a college
B.
near a bus stop
C.
near a hospital
D.
near a railway station
查看完整题目与答案
相关题目：
【判断题】基团O=C一H的v(C一H)出现在2720cm-1( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Directions: This section is totest your ability to understand short conversations. There are 2 recordedconversations in it. After each conversation, there are some recordedquestions. Both the conversa...
A.
To his hometown
B.
To the beach
C.
To his university.
D.
To the hospital.
查看完整题目与答案
【单选题】Directions: In this section,you will hear three news reports. At the end of each news report,you will hear two or three questions. Both the news report and the questions will be spoken only once.After...
A.
1. A) There are some coffee drinkers around the world.
B.
B) Drinking coffee helps people live longer.
C.
C) People have different coffee drinking habits.
D.
D) Coffee can protect against all diseases.
查看完整题目与答案
【判断题】基团O=C-H的v(C-H)出现在2720cm-1。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Section B Directions: This section is to test your ability to understand short conversations. There are 2 recorded conversations in it. After each conversation, there are some recorded questions. Both...
A.
One.
B.
Two.
C.
There.
D.
Four.
查看完整题目与答案
【简答题】某厂利用一种天然产物进行发酵，发现发酵酒中含有U、V、W、X等多种化合物。已知： ①U和W 均可与银氨溶液反应，析出金属银，而且U是一种单糖； ②V是个单官能团化合物，其碳原子数和X相 同，V在浓硫酸作用下加热得到Y，Y可以使溴水褪色； ③V经缓和氧化可以生成W； ④V和X在少量浓硫酸作用下经加热可得到Z； ⑤X的组成为C-40%，H-6.7%，O-53.3%，X含有一个羧基，已知 450mg X...
查看完整题目与答案
【简答题】某厂利用一种天然产物进行发酵，发现发酵液中含有U、V、W、X等多种化合物。已知①U和W均可与银氨溶液反应，析出金属银，而且U是一种单糖。②V是单官能团化合物，其碳原子数和X相同。V在浓硫酸作用下经加热得Y，Y可以使溴水褪色。③V经催化氧化可生成W。④V和X在少量浓硫酸作用下经加热可以得到Z。⑤X的组成为C∶40％；H∶6.7％；O∶53.3％。X含有一个羧基，450mgX与0.20mol/L的Na...
查看完整题目与答案
【单选题】Part I (2*10=20%) Directions: In this section you will hear ten short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the questi...
A.
The first person had some fried food at home.
B.
The first person had a flat tire on the way home.
C.
The second person had a flat tire on the way home.
D.
The second person had some fried food at home.
查看完整题目与答案
【判断题】基团O-C--H 的v(C H) 出现在2720cm
A.
正确
B.
错误
查看完整题目与答案
【单选题】Part II (3*10=30%) Directions: In this section, you will hear 3 short passages. Each passage will be spoken TWICE. At the end of each passage, there will be a pause. During the pause you must read the...
A.
near a college
B.
near a bus stop
C.
near a hospital
D.
near a railway station
查看完整题目与答案
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