问题 问答题 简答题

控释肥料有哪些标准?

答案

参考答案:

控释肥料有如下几个标准:

(1)在25℃温度下,肥料中养分在24小时(即一天)之内的养分释放率(肥料中的化学物质形态转变为植物可利用的有效形态)不超过15%;

(2)在28天或者一个月之内的养分释放率不超过75%;

(3)在规定时间内,养分释放率不低于75%;

(4)专用控释肥料的养分释放曲线与相应的作物的养分吸收曲线相吻合。

阅读理解

阅读短文,选择正确答案。

       Here are some tips (建议) on how to stay safe in earthquakes (地震).

      1. Stay inside and duck and cover. Get under a desk or table, or stand in a corner or under a doorway.

Cover your head and neck with your arms.

      2. Move against a wall if in a high building with no protective desk or table nearby. Cover your head and

neck with your arms. 

      3. Try to get into an open area away from trees, buildings, walls, and power lines (电杆) if outdoors. 

      4. Pull over (停靠) to the side of the road away from overpasses (天桥) and power lines if driving. Stay in

your car until the shaking ends.

      5. Get away from shelves or other areas where objects may fall if in a crowded store or public area. Do

not run for the door. Lower your body close to the ground and cover your head and neck with your hands and

arms.

      6. Stay in your seat if in a cinema or a theater. Get below the level of the back of the seat and cover your

head and neck with your arms. 

      7. If you take cover (躲避) under a strong piece of furniture,hold on to it and be prepared to move with

it. 

      8. Try to stay away from kitchens, where there are often many objects that might fall or get burnt.

1. The underlined word "duck" in Tip 1 means            . [ ]

A. a water bird with short legs

B. some kind of meat for eating

C. walk like a duck

D. lower your head or body very quickly

2. _______ should be the most important part(s) to be protected in an earthquake. [ ]

A. Your head and arms

B. Your arms

C. Your neck and arms

D. Your head and neck

3. Tip3 and Tip4 give you some advice on what you should do when you are            . [ ]

A. inside a building

B. outside a building

C. in your house

D. in a store

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