当有电流在接地点流入地下时,电流在接地点周围土壤中产生电压降。人在接地点周围,两脚之

题型:单项选择题

问题:

当有电流在接地点流入地下时,电流在接地点周围土壤中产生电压降。人在接地点周围,两脚之间出现的电压称为( )。

A.跨步电压

B.跨步电势

C.临界电压

D.故障电压

考点:安全工程师安全生产技术安全生产技术
题型:单项选择题

在△ABC中,B=60°,最大边与最小边之比为2∶1,则最大角为(  )

A.45°

B.60°

C.75°

D.90°

题型:单项选择题

患者,男性,23岁,在工地上被铁钉扎伤来院就诊,医嘱行破伤风抗毒素皮试,皮试结果阳性,拟进行脱敏注射,方法为()

A.分2次肌内注射

B.分4次肌内注射

C.分2次平均稀释肌内注射

D.分4次平均稀释肌内注射

E.分4次逐渐增量稀释肌内注射

题型:单项选择题

One day a mime(哑剧演员) is visiting the zoo and wants to make some money as a street performer. As soon as he starts to draw a crowd, a zookeeper drags him into his office. The zookeeper explains that the zoo’s most popular attraction, a gorilla(大猩猩), has died suddenly and the keeper fears that attendance at the zoo will fall off. He offers the mime a job to dress up as the gorilla. The mime accepts.

The next morning the mime puts on the gorilla suit and enters the cage before the crowd comes. He soon discovers he can sleep all as he likes, play and make fun of the people and he draws bigger crowds than he ever did as a mime — the job he likes but loses.

However, with days going by, he begins to notice that the people are paying more attention to the lion in the cage next to his. Not wanting to lose the attention of his audience(观众), he climbs to the top of his cage, crawls across a partition(隔墙), and dangles(悬挂) from the top to the lion’s cage. The lion gets angry at this. The scene is afuel to the crowd.

At the end of the day he is given a pay raise for being such a good attraction. Well, this continues for some time. The crowds grow larger, and the mime’s pay keeps going up.

Then one day when he is dangling over the lion he slips and falls. The mime is terrified(吓坏). He starts screaming, “Help me!”, but the lion is quick. The mime soon finds himself flat on his back looking up at the angry lion and the lion says, “Shut up you fool! Do you want to get us both fired?”

小题1:How does the mime find the job dressing up as the gorilla?

A.Hard and tiring.

B.Dangerous.

C.Easy and fun.

D.Boring.小题2:The mime’s first contact with the lion is to __________.

A.find pleasure for himself

B.get the lion’s attention

C.get his pay raised

D.win back his audience小题3:The underlined works “a fuel” in Paragraph 3 can be replaced by __________.

A.frightening

B.common

C.exciting

D.familiar小题4:From the last paragraph we can know that ___________.

A.the lion will eat the poor mime

B.the lion is also played by a person

C.the animals in the zoo are all played by people

D.animals played by people can attract more visitors

题型:单项选择题

土壤盐置换性酸

题型:单项选择题

酸碱中和滴定时,在等当点处溶液应显中性。

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