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SINUMERIK820S系统具有那些特性

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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。

A. 4
B. 10
C. 15

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在生产工艺过程中，静电时有出现，它可能给人以点击，还可()。

A. 使电器开关跳闸
B. 使产品质量下降
C. 使人昏昏欲睡，工作效率降低

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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.

A. They don’t have much choice of jobs.
B. They are likely to get much higher pay.
C. They don’t have to go through job interviews.
D. They will automatically be given hiring priority.

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Section B
Directions: In this section, you will hear two long conversations. At the end of each conversation you will hear four questions. Both the conversations and the question-s 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 8 to 11 are based on the conversation you have just heard.
8.

A.He will be kept from promotion.
B.He will go through retraining.
C.He will be given a warning.
D.He will lose part of his pay.

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