未分类题
下列玻璃仪器不能用毛刷刷洗的是
A、量瓶
B、移液管
C、比色皿
D、滴定管
E、烧杯
【参考答案】
C
解析: 分光光度法中所用的比色皿,是光学玻璃制成的,不能用毛刷刷洗。避免将光学窗面擦伤。
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Firecrackers are synonymous with China’s Spring Festival celebrations, yet this time-honored tradition is in grave danger of bidding farewell to the Chinese New Year celebration. Some people believe that fireworks should be banned for safety and environmental concerns. Write a composition of about 400 words on the following topic;In the first part of your essay you should state clearly your main argument, and in the second part you should support your argument with appropriate details. In the last part you should bring what you have written to a natural conclusion or make a summary.You should supply an appropriate title for your essay.Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.Should Fireworks Be Allowed for Spring Festival Celebrations?
A.You
B.
Marks
C.
Should
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In the wake of an increasing number of cheating cases and the emergence of cheating by advanced technology, the academic honesty contract has been introduced in numerous campuses before examinations. It is assumed that such contracts may help discourage cheating. Do you believe that such a policy will work wonder? Write a composition of about 400 words to state your view.In the first part of your essay you should state clearly your main argument, and in the second part you should support your argument with appropriate details. In the last part you should bring what you have written to a natural conclusion or make a summary.You should supply an appropriate title for your essay.Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.
A.In
B.
You
C.
Marks
D.
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