问题 问答题 简答题

如何进行粮面压盖密闭?

答案

参考答案:

我国南方基层粮库总结出一套在仓房密闭基础上,再进行粮面压盖的经济、实用的隔热做法,其效果很好。粮面压盖的做法有:一是散粮面上盖席或铺窗纱后,用干燥无虫的大糠等进行压盖,如浠水粮库在粮面上铺塑料窗纱用稻壳压盖;二是用稻壳等装袋压盖,袋袋半包,平贴合缝,互相错缝,做到平、紧、密、实,以加强密封效果,如越州粮库、德清粮库对散粮用10cm厚装有稻壳的布袋压盖加薄膜一面封,越州粮库对包装粮采取下垫上铺、薄膜五面封或六面封的做法;三是用隔热材料进行粮面压盖,如麻城库用薄膜加5cm泡沫塑料板或用薄膜加PEF隔热保温板压盖,以增加粮堆的隔热效果。

单项选择题
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If you have ever been rock climbing, you will know that it is not a very easy sport. In fact, you probably felt quite defeated when you first tried to do any serious climbing. Indoor and outdoor rock climbing are both extremely demanding and require practice to get good at. It is one of the most physically and mentally demanding sports.

There are three basic types of rock climbing. Top roping is the most common type and the climber need to climb with a partner. The second type, which is very similar to top roping, is called lead climbing. In both of the types, the climber can sit off the wall and rest on the rope. The third type is called bouldering. Bouldering is a type of free climbing without any ropes. This is the most demanding of all climbing types. The climber must be able to complete the climbing without taking a rest on the rope.

Believe it or not, climbing is said to be about 75% legs and only 25% arms. To climb efficiently and successfully, a person needs to have a wonderful technique. One of the major rules of rock climbing is to always have three points touching the wall, whether it is both feet and one hand, or one foot and both hands, as it is much easier to have your weight  cases will not do the climbing; they only hold you into the wall so that your legs are actually pushing you upward. Also, the closer you are to the wall, the easier it is to climb.

Rock climbing may sound a bit too extreme for the everyday person, but it is really an amazing workout. Once you get into the sport, and learn how to position your body and rest your weight, then you can begin to deal with some difficult problems. The great thing about rock climbing is that it is mentally challenging as well. You are constantly analyzing the way your body moves and how to do certain moves on the wall. For anyone who wants to get into shape, rock climbing is a fun and effective way to exercise muscles.

小题1:What does the author think of rock climbing?

A.It is an easy sport.

B.It is challenging.

C.It is quite dangerous.

D.It is extremely difficult.小题2:From the text we know that _____________.

A.indoor rock climbing is much easier than outdoor rock climbing

B.while rock climbing, people depend mainly on their arms

C.ordinary people can practise rock climbing

D.during climbing, the climber can always stop for a rest小题3:While climbing, it is much easier for a rock climber if he __________.

A.takes a rope

B.has a partner

C.has three points touching the wall

D.uses feet more often小题4:__________ will make rock climbing easier.

A.Keeping the body closer to the wall

B.Resting more often on the arms

C.Resting more often on the feet

D.Pushing forward without thinking of the problems小题5:By rock climbing, one can _______.

A.get more weight and stronger muscles

B.get both physical and mental exercises

C.have a terrible experience that will last long

D.probably feel quite defeated