【預告】5/13(一)起，第三階段頁面上方功能列以及下方資訊全面更換新版。 前往查看

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5 These two purposes rely on the creation and detection of electromagnetic ....... and electrical currents.
(A) fields
(B) floors
(C) grounds
(D) surfaces



5 These two purposes rely on the creatio..-阿摩線上測驗