简述硫酸的危险特性?

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问题:

简述硫酸的危险特性?

考点:循环水操作工循环水操作工题库
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()是我国的政体,也是我国的根本政治制度。

A.人民代表大会制度

B.中 * * 党领导的多党合作和政治协商制度

C.人民民主专政

D.坚持中 * * 党领导

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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

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甲的一头牛走失,乙牵回关人自家牛棚,准备次日寻找失主。当晚牛棚被台风刮倒,将牛压死。乙将牛肉和牛皮出售,分别得款500元和100元。请人屠宰及销售,支出100元。下列哪一种说法是正确的

A.甲有权要求乙返还一头同样的牛

B.甲有权要求乙返还500元

C.甲有权要求乙返还600元

D.甲有权要求乙按该牛的市价赔偿1000元

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估计医学参考值范围,选择百分界限时()

A、最好选用95%

B、应尽可能减少假阳性率(误诊率),即选择较高百分界限,如99%

C、应尽可能减少假阴性率(漏诊率),即选择较低百分界限,如80%

D、应该根据研究目的和实用,权衡假阳性和假阴性的比例,选择适当的百分界限

E、实际很难选择适当的百分界限,习惯上取95%

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商品的价值是()

A、由抽象劳动形成的

B、由具体劳动创造的

C、一般人类劳动的凝结

D、体现着商品生产者之间的生产关系

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