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发布时间: 1970-01-01

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1最佳选择题 3分

PassageOne Themakingofglassisaveryoldindustry

  • A. has been put into actual use
  • B. was first put into actual use in 1977
  • C. had been repeatedly experimented on before 1977
  • D. was put on experiment in 1977
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本题解析: 暂无解析

2最佳选择题 3分

PassageOne Themakingofglassisaveryoldindustry

  • A. glass fiber is less expensive
  • B. glass fiber delivers messages directly
  • C. glass fiber is more up to date
  • D. glass fiber is easier to make
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本题解析: 暂无解析

3最佳选择题 3分

PassageOne Themakingofglassisaveryoldindustry

  • A. Glass is very useful because it has many unusual qualities.
  • B. Light signals have changed the use of glass in industry.
  • C. Glass fibers have reduced the cost of telephone communication.
  • D. The use of glass fibers to carry telephone messages is an interesting new development.
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本题解析: 暂无解析

4最佳选择题 3分

PassageOne Themakingofglassisaveryoldindustry

  • A. sound signals
  • B. light signals
  • C. electrical signals
  • D. any signals
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本题解析: 暂无解析

5最佳选择题 3分

PassageOne Themakingofglassisaveryoldindustry

  • A. electrical signals must first be changed' into light signals and then into sound
  • B. the light signals have to be changed directly into sound
  • C. light must first be changed into electrical signals and then into sound
  • D. neither the light nor the electrical signals have to be changed in any way
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本题解析: 暂无解析

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