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【简答题】
圆既是______对称图形，又是______对称图形；它的对称中心是______，对称轴是______，有______条对称轴．
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反馈参考答案：
举一反三
【简答题】所谓三相对称绕组，是指（），且在（）的三相绕组。
【单选题】How does Bill’s company ensure product safety?
A.
By testing products on animals.
B.
By developing safety technologies.
C.
By conducting human experiments.
D.
/
【单选题】你们怎样确保食品安全?
A.
How about the food safety?
B.
How do you ensure the food safety?
C.
What about the food insurance?
D.
Can you ensure the food safety?
【简答题】所谓三相对称绕组，是指各相绕组结构（）都相同，且绕组空间互有120°（）的三相绕组。
【单选题】What is the main topic of this news?
A.
How to ensure safe navigation at night.
B.
The possible reasons for greenhouse effect and the solutions.
C.
How to use the Sun's rays to help flights.
D.
Negative effects of the nighttime flight on the environment.
【简答题】Information Management: how to ensure that information is managed effectively within a company
【简答题】A．How to make a powerful rocket engine. B．How to ensure the safety of the crew. C．How to choose qualified crewmen for the trip. D．How to enable the spacecraft break free of gravity.
【简答题】所谓三相对称绕组，是指（）都相同，且在空间（）的三相绕组。
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