英国科学家普利斯特利普做过如图的实验:在甲、乙两个密闭的玻璃容器内,甲中放一只小

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问题:

英国科学家普利斯特利普做过如图的实验:在甲、乙两个密闭的玻璃容器内,甲中放一只小白鼠,乙内放了一盆绿色植物和一只小白鼠.分别给予足够的光照,发现在乙容器中的存活时间长许多.此实验说明光合作用释放氧气.

(1)实验中甲是乙的对照,为使实验更为可靠,这两容器内的小白鼠应该______;

(2)如果用黑布将乙容器完全罩住,那么这只小白鼠存活的时间比没罩时短,这是因为______.

考点:光合作用和呼吸作用氧气的用途自然界中的氧循环
题型:问答题

证券营业部接收客户买卖证券委托,委托执行采用的申报方式有()。

A.市价委托申报

B.限价委托申报

C.由客户或证券经纪商营业部业务员直接申报

D.由证券经纪商的场内交易员进行申报

题型:问答题

关系模式 Student(Sno,Sname,Cno, Cname,Grade,Tname,Taddr)的属性分别表示学号、学生姓名、课程号、课程名、任课教 师名和教师地址。其中,一个学生可以选修若干门课程,一个教师可以讲授若干门课程, 一门课程可以有若干教师讲授,一个学生选修一门课程时必须选定讲授课程的教师,教 师不会重名。关系模式 Student 的候选关键码有______。

A.1 个,为(Sno,Cno)

B.1 个,为(Sno,Cno,Tname)

C.2 个,为(Sno,Sname,Cno)和(Sno,Cno,Tname)

D.2 个,为(Sno,Sname,Cno)和(Sname,Cno,Tname)

题型:问答题

Musa teaches English at Chunmiao Primary School in Wuhan. He had never heard of China’s idol (偶像) of selflessness before he arrived in the country, but this unusual young man from Nigeria is carrying on the good work of China’s hero soldier.

Musa’s week begins with a crowded two-hour bus ride for a flag-raising ceremony (仪式) at Chunmiao Primary School with old classrooms for the children of migrant (移民) workers on the outside parts of Wuhan.An hour later, he steps in front of a room full of expectant (期盼) students, some of whom recently organized a dance exhibition for their foreign teacher.

The dance showed the spirit of Lei Feng (1940-1962), a soldier who was idolized (作偶像) across China for his selflessness. It was especially meaningful to Musa because the students call him “foreign Lei Feng”.

“I know Lei Feng, he is a good man. Everyone should learn from Lei Feng,” he says.

Born to a family of diplomats (外交官) in 1985, he is the second of nine children and the eldest son. Musa was expected to become a diplomat like his father, who worked in Canada from 2007.In 2008, Musa was picked by Nigeria’s Ministry of Foreign Affairs to study in China for a master’s degree in sociology (社会学硕士学位). With the hope of joining the foreign service, he then went on to study for a doctor’s degree in international relations at Central China Normal University.

小题1:The students Musa teaches at Chunmiao Primary School are __________.

A.native children in Wuhan

B.children of workers from outside Wuhan

C.children from different foreign countries

D.children from poor families小题2:Musa is called “Foreign Lei Feng” because __________.

A.he is doing good deeds as Lei Feng did

B.he is teaching English at a primary school

C.he is loved and respected by the students

D.he helps the students dropping out of school小题3:Some students organized a dance exhibition to __________.

A.say good bye to their foreign teacher

B.show their wish to learn English

C.remember China’s hero soldier

D.honor their foreign teacher小题4:Before he came to China, Musa ___________.

A.taught English in his country

B.did what Lei Feng did in the countryside

C.knew nothing about Lei Feng

D.was interested in Chinese dance小题5:What can we learn about Musa from the last paragraph?

A.He studies Chinese in a China’s University.

B.He has an elder sister in his big family.

C.He was a foreign official in Canada.

D.He got a doctor’s degree in a China’s University.

题型:问答题

白细胞减少和粒细胞缺乏症指外周血中

A.白细胞<4×109/L,粒细胞<2×109/L
B.白细胞<3×109/L,粒细胞<2×109/L
C.白细胞<3×109/L,粒细胞<1×109/L
D.白细胞<4×109/L,粒细胞<0.5×109/L

题型:问答题

柴油机电控燃油喷射系统的主要有哪些控制。

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