问题 问答题 简答题

什么是自发气调贮藏和可控气调贮藏?

答案

参考答案:

自发气调贮藏是指将生药密封在具有透气性能的塑料薄膜或带硅窗的塑料薄膜袋或帐中,利用生药自身呼吸作用和塑料的透气性,在一定温度条件下,自发调节密闭环境中的O2和CO2的含量,使之适合气调贮藏的要求,简称MA贮藏。例如塑料薄膜大帐法、硅胶窗薄膜封闭法等。

可控气调贮藏指将生药密封在不透气的气调室(或库)内,利用生药呼吸作用,并采用机械气调设备,对密闭系统中O2和CO2气体人工调节到适宜的气体组成的贮藏方法。

由于自发气调贮藏主要依靠生药自身的呼吸作用进行气体调节,因此主要适宜于短期贮藏,相对可控气调贮藏贮藏效果较差。

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The Greenest School in Britain

The pupils and teachers at Fairfield School think it's worth looking after the environment! This is what they've been doing:

Growing vegetables

Fairfield School pupils started their own vegetable garden. Both children and teachers plant and water the seeds ( 种子), then I hey pick the vegetables, which are used in school meals. Now they can all enjoy healthy food at lunchtime. "School dinners are tastier than ever before! " says one pupil.

Recycling

The Fairfield pupils don't just bring their books to school—they bring their rubbish too! There are recycling bins (回收箱 )in the playground for cans, plastic bottles, batteries and paper. The teachers give a prize every month to the pupil who's tried the hardest to recycle.

Planting trees

"This used to be one of the least beautiful areas of the city with no green areas, says the head teacher Lynne Johnson. "Now every child has planted their own tree, which he or she looks after during the week. They've made the view from the classroom more beautiful!

Finding cleaner ways to get around

Everyone walks or cycles to Fairfield School! "When the roads are busy, it’s faster to ride bikes than to go by car anyway,” says one pupil. Even the teachers don't use their cars. "We won't encourage our pupils to look after the environment if we don't do it ourselves! " says one teacher.

小题1:Every month the pupil who has done the best to recycle will_ _from the

teachers.

小题2: Neither the__________nor the __________ in Fairfield school go to school by car.

小题3:The pupils have made the view from the classroom more beautiful by __________.

小题4:From the passage we know that the teachers in this school set a good __________ to the pupils in protecting the environment.

小题5: They use the vegetables which are __________ and picked by themselves in school meals.

单项选择题 A1/A2型题