可作为丝虫病媒介的蚊种是A.白纹伊蚊与三带喙库蚊 B.淡色库蚊与中华按蚊 C.以上蚊

题型:单项选择题

问题:

可作为丝虫病媒介的蚊种是

A.白纹伊蚊与三带喙库蚊

B.淡色库蚊与中华按蚊

C.以上蚊种均可传播

D.嗜入按蚊与大劣按蚊

E.中华按蚊与微小按蚊

考点:基础医学医学寄生虫学昆虫纲
题型:单项选择题

如图所示,水平光滑绝缘轨道MN的左端有一个固定挡板,轨道所在空间存在E=4×102N/C、水平向左的匀强电场.一个质量m=0.1kg带电荷量q=5×10-5C的滑块(可视为质点),从轨道上与挡板相距x1=0.4m的P点由静止释放,滑块在电场力作用下向左做匀加速直线运动.当滑块与挡板碰撞后滑块沿轨道向右做匀减速直线运动,运动到与挡板相距x2=0.33m的Q点时,滑块第一次速度减为零.若滑块在运动过程中,电荷量始终保持不变.求:

(1)滑块第一次与挡板碰撞所损失的机械能△E大小?

(2)若每次滑块除最后一次与挡板碰撞外,每一次与挡板碰撞所损失的机械能均相同.滑块最终至少能与挡板碰撞多少次?

题型:单项选择题

假如我和你辩论,我们之间能够分出真假对错吗我和你都不知道,而所有其他的人都有成见,我们请谁来评判请与你观点相同的人来评判,他既然与你观点相同,怎么能评判请与我观点相同的人来评判,他既然与我观点相同,怎么能评判请与你、我的观点都不相同的人来评判,他既然与你、我的观点都不相同,怎么能评判请与你、我的观点都相同的人来评判,他既然与你、我的观点都相同,怎么能评判所以,“辩无胜”。
下面哪一项最准确地描述了上面论证的缺陷

A.上述论证犯有“文不对题”的逻辑错误。

B.上述论证犯有“混淆概念”的逻辑错误。

C.上述论证中的理由不真实,并且相互不一致。

D.上述论证完全忽视了有超出辩论者和评判者之外的客观事实标准和逻辑标准。

题型:单项选择题

阅读理解。

     One of the traditions which is now a necessary part of Christmas is that of Father Christmas, or Santa

Claus. According to the modem legend, he is a magical figure who visits all the children of the world during

the night before Christmas Day, leaving presents which they find the next moming. He flies through the

night sky in a sledge pulled by reindeer, and enters houses by climbing down chimneys. This strange legend

is based on the life of a man called Nicholas, but in fact we know very little about him. Historians think he

was a Christian bishop (主教) in Turkey in about 285-350. One of the stories about him is that he helped

three poor girls. No one would marry them because they were so poor.To provide them with money for their

weddings, Nicholas secretly dropped some gold coins down the chimneys of their houses. After Nicholas

died, he was made a saint (圣人) by the church. (The name Santa Claus thus comes from St Nicholas.) His

feast day was celebrated in December, and parents started giving their children secret presents from St

Nicholas. Over the years, this custom became part of our Christmas traditions.

     Recently, a psychologist has claimed that Father Christmas is "the perfect fantasy" for children. According

to Professor Anthony Clare, children love the character of Father Christmas because he is like an ideal father:

he loves children and gives them presents, but he never criticizes them, or becomes angry, and children do

not even need to thank him for the presents. Other writers, however, point out that Father Christmas can be

a frightening character to some children. Jane Bidder says that some children are terrified of this fat, bearded

old man. It can certainly confuse many children. As parents, we warn our children to be careful of strangers

and never let them onto the house, and yet we tell children that a strange man will come into their bedroom at

night! Some children can become very worried about this idea and fear that he is a kind of burglar.

     Most children, however, understand from their parents and from the media that Father Christmas is

basically a benign character, and look forward to his annual visit with joy and excitement.

1. The main point of the first paragraph is that [ ]

A. Father Christmas is an important part of Christmas

B. the tradition of Father Christmas is a modem idea

C. Father Christmas is a magical figure who can fly

D. the legend about Father Christmas are not true

2. The writer mentions details such as Father Christmas's sledge,the reindeer and the way he climbs down

    chimneys because he _____.[ ]

A. wants to make it clear that these things are impossible

B. is describing the history of St Nicholas

C. wants everyone to believe that Father Christmas is real

D. is explaining the modern legend of Father Christmas

3. Why does the writer mention the story about St Nicholas helping three poor girls? [ ]

A. It shows us that historians know very little about him.

B. This story explains why parents give secret presents to children.

C. It supports the writer's main point that Father Christmas is based on an untrue story.

D. This story explains why we celebrate. Christmas in December.

4. In the last paragraph, the word "benign" means _____. [ ]

A. religious

B. friendly

C. frightening

D. unreal

5. The best title for this passage would be _____. [ ]

A. Is Father Christmas Dangerous?

B. The True History of St Nicholas

C. The Legend of Santa Claus

D. The Traditions of Christmas

题型:单项选择题

英版航海图书资料主要有哪几种?

题型:单项选择题

()表示班轮航线上各港口的平均装卸效率和组织管理水平,决定着航线上船舶的在港时间的班轮航线参数是航线平均装卸总定额。

更多题库