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Juanis finishing writing his specific purpose. He brainstorms about his specific purpose and finally settles on three topics he plans on talking about during his speech. What are these three topics called?

A. specific topics
B. main points
C. generalized topics
D. specific points

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What is one technique you should not use when delivering your speech?

A. Eye contact
B. One tone; one speed
C. Motion
D. Pauses

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Which of the following is a tip for effectively using presentation aids?

Always pass around presentation aids so your audience can view them up close.
B. If something happens to your aid, there’s no reason to keep going.
C. Every slide, graphic, and word on a computer presentation should be animated.
D. Aids need to be large enough to be seen by your entire audience.

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含有0.1250g I2的KI溶液25mL，用25 mL CCl4与之仪器振荡。I2在CCl4和KI溶液之间的分配达到平衡后，在水相中测得0.0050g I2，若每次用25mL CCl4萃取25mL该溶液，共萃取两次，萃取率是（）

A. 86.0%
B. 96.0%
C. 99.0%
D. 99.8%

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Fe3+在某有机相与水相的分配比是99，今有含10mg Fe3+的水溶液，若用等体积该有机溶剂萃取两次，则水相中剩余Fe3+的质量是（）

A. 0.03mg
B. 0.01mg
C. 0.003mg
D. 0.001mg

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Juanis finishing writing his specific purpose. He brainstorms about his specific purpose and finally settles on three topics he plans on talking about during his speech. What are these three topics called?

A. specific topics B. main points C. generalized topics D. specific points

What is one technique you should not use when delivering your speech?

Which of the following is a tip for effectively using presentation aids?

含有0.1250g I2的KI溶液25mL，用25 mL CCl4与之仪器振荡。I2在CCl4和KI溶液之间的分配达到平衡后，在水相中测得0.0050g I2，若每次用25mL CCl4萃取25mL该溶液，共萃取两次，萃取率是 （ ）

Fe3+在某有机相与水相的分配比是99，今有含10mg Fe3+的水溶液，若用等体积该有机溶剂萃取两次，则水相中剩余Fe3+的质量是 （ ）

A. specific topics
B. main points
C. generalized topics
D. specific points

含有0.1250g I2的KI溶液25mL，用25 mL CCl4与之仪器振荡。I2在CCl4和KI溶液之间的分配达到平衡后，在水相中测得0.0050g I2，若每次用25mL CCl4萃取25mL该溶液，共萃取两次，萃取率是（）

Fe3+在某有机相与水相的分配比是99，今有含10mg Fe3+的水溶液，若用等体积该有机溶剂萃取两次，则水相中剩余Fe3+的质量是（）