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高氯酸是最強的酸，質量分數為60％的高氯酸溶液加熱不分解，濃度增高就不穩定，受熱易分解，熱、濃的高氯酸溶液遇有機物易爆炸，純高氯酸的沸點是130℃。現有市售的70％高氯酸，為使其進一步濃縮，所采取的措施正確的是：
A.
加入濃硫酸后再小心常壓蒸餾
B.
各儀器連接處的橡皮塞應塞緊防止漏氣
C.
加入濃硫酸后再減壓蒸餾
D.
各儀器連接處必須用磨口玻璃裝置
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舉報參考答案：
舉一反三
【單選題】The underlined phrase “sour the pleasure of society’’ in the second paragraph means“___”.
A.
have a good taste with social life
B.
make others unhappy
C.
tend to scold others openly
D.
enjoy the pleasure of life
【單選題】have baskets ready for people to carry the things they are going to buy .
A.
Shopping centers
B.
Supermarkets
C.
Five-and-ten-cent stores
D.
Fine stores in America
【單選題】Which of the following can best summarize the main idea of Paragraph 3?
A.
Think beyond academics.
B.
Learn each concept.
C.
Plan a trip to use your skills.
D.
Consider a language as a tool.
【單選題】According to the passage，the writer prefers to communicate with__________.
A.
people who are happy
B.
people who are unhappy
C.
A and B
D.
None of them
【單選題】If such unhappy person insists on keeping the habit，the author suggests people should___.
A.
pr any communication with them
B.
show no respect and politeness to them
C.
persuade them to recognize the bad effects
D.
quarrel with them until they realize the mistakes
相關題目：
【單選題】The underlined phrase “sour the pleasure of society’’ in the second paragraph means“___”.
A.
have a good taste with social life
B.
make others unhappy
C.
tend to scold others openly
D.
enjoy the pleasure of life
【單選題】have baskets ready for people to carry the things they are going to buy .
A.
Shopping centers
B.
Supermarkets
C.
Five-and-ten-cent stores
D.
Fine stores in America
【單選題】Which of the following can best summarize the main idea of Paragraph 3?
A.
Think beyond academics.
B.
Learn each concept.
C.
Plan a trip to use your skills.
D.
Consider a language as a tool.
【單選題】According to the passage，the writer prefers to communicate with__________.
A.
people who are happy
B.
people who are unhappy
C.
A and B
D.
None of them
【單選題】If such unhappy person insists on keeping the habit，the author suggests people should___.
A.
pr any communication with them
B.
show no respect and politeness to them
C.
persuade them to recognize the bad effects
D.
quarrel with them until they realize the mistakes
參考解析：
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