题目内容
变频器改造设备调速系统提高了()的性能，降低了电能消耗。
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SINUMERIK820S系统具有那些特性
箱式变电站所在接地应公用一组接地装置，其接地电阻应小于()Ω。
在生产工艺过程中，静电时有出现，它可能给人以点击，还可()。
Section C
Directions: In this section, you will hear three passages. At the end of each passage, you will hear three or four questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.
Questions 16 to 18 are based on the conversation you have just heard.
16.
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