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| 41. | a conductor used to make electrical contact with some nonmetallic part of a circuit. |
| 用非金属做电源插头作为整个电路一部分的导体。 |
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| 42. | a monthly [ weekly ] publication |
| 月[周]刊 |
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| 43. | a weekly moonthly ] periodical |
| 周月]刊 |
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| 44. | 1. live in, I, China |
| Make sentences. 用所给单词组成句子。 |
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| -- 来源 -- 小学英语同步练 五年级上册 与冀教教材同步(无声音) - Unit 1 My Family Lesson 7 Are You Ready for a Quiz? |
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| 45. | pass through a cycle |
| 经过一个周 |
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| 46. | It takes a year for the earth to make a circuit of the sun. |
| 地球绕太阳一周要一年时间。 |
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| 47. | His name is Zhou Zhou. |
| 他叫周周。 |
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| -- 来源 -- 地道口语脱口SHOW 初中基础篇 - Unit 3 In class (2) |
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| 48. | For low-frequency currents(up to about 15, 000 cycles per second)an iron core, called a magnetic circuit |
| 对于低频率电流（约15，000周／秒以内），置有一个叫作磁路的铁心。 |
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| 49. | A circuit arrangement for deriving a phantom circuit. |
| 用来派生一个幻象电路的电路结构。 |
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| 50. | Chou Ch'en A-chun |
| 周陈阿春 |
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