在间歇反应器中进行等温一级反应A&rarr;B，<img src="https://nimg.ppkao.com/2019-05/tangling/2019051717225041117.jpg?sign=f419026f616670f65a4210dacaa4a537&t=62d7b14f" />，当<img src="https://nimg.ppkao.com/2019-05/tangling/2019051717231391587.jpg?sign=d2c4202133d390c4f1955c33dd0f321a&t=62d7b14f" />时，求反应至<img src="https://nimg.ppkao.com/2019-05/tangling/2019051717232354445.jpg?sign=59f1f453652bb92d6bf025eccd695506&t=62d7b14f" />所需时间t=（）秒。