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ƼӢ޴ϵ Ҫ¼档(һӶ࣬ʱ̬
ƼӢ.ǿֵس⣬д ״̬˵͹ ܣһԡƵԺԡˣ   ʱֱΪ࣬̾ ʾ١еν ﶯҲһʱһʱȥʱͽʱʱҲʱ ڽʱʮֶʱ̬еʽõý١뿴¼
34) Cenerators and motors work on the same principle, but pro¬duce opposite effects.
Ĺԭ ͬЧ ȴһʱ
35) It was not until 15th century that men began to accept the evidence for a sphericed carth. ֱ15 ʼܵԲһ۵㡣һ
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