1個回答
金程教育顧老師助教
2017-12-29 11:26
該回答已被題主采納
學員你好,peak前是late expansion, peak后是early contraction,trough前是late contraction,trough后是early expansion。
該回答已被題主采納學員你好,peak前是late expansion, peak后是early contraction,trough前是late contraction,trough后是early expansion。