【单选题】【消耗次数：1】
Goodtimingis______toourplans.
①
especial
②
essential
③
complete
④
equivalent
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相关题目
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随机题目
【单选题】
下列关于需求弹性的叙述错误的是（ ）
①
|Ed|=0，需求完全缺乏弹性
②
|Ed|＞1，需求富有弹性，又称弹性充足
③
|Ed|＜1，需求缺乏弹性，又称需求弹性不足
④
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