烽火OL100系列光纤收发器又可分为()和()两类型,其中单纤双向光纤收发器只需一根

题型:填空题

问题:

烽火OL100系列光纤收发器又可分为()和()两类型,其中单纤双向光纤收发器只需一根光纤就可进行双向以太网数据传输。

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题型:填空题
已知椭圆
x2
a2
+
y2
b2
=1(a>b>0)
的两个焦点为F1,F2,椭圆上一点M(
2
6
3
3
3
)
满足
MF1
MF2
=0

(1)求椭圆的方程;
(2)若直线L:y=kx+
2
与椭圆恒有不同交点A、B,且
OA
OB
>1
(O为坐标原点),求k的范围.
题型:填空题

They are among the 250, 000 people under the age of 25 who are out of work in the Netherlands, a group that makes up 40 percent of the nation’s unemployed. A storm of anger boils up at the government-sponsored (政府资助的) youth center, even among those who are continuing their studies.

“We study for jobs that don’t exist,” Nicollets Steggerda, 23, said.

After thirty years of prosperity, unemployment among 10 member nations of the European Community has reached as much as 11 percent, affecting a total of 12.3 million people, and the number is climbing.

The bitter disappointment long expressed by British youths is spreading across the Continent. The title of a rock song “No Future” can now be seen written on the brick walls of closed factories in Belgium and France.

One form of protest(抗议) tends to put the responsibility for a country’s economic troubles on the large numbers of “guest workers” from Third World nations, people welcomed in Western Europe in the years of prosperity.

Young Europeans, brought up in an extended period of economic success and general stability, seem to be similar to Americans more than they do their own parents. Material enjoyment has given them a sense of expectation, even the right to a standard of living that they see around them.

“And so we pass the days at the discos, or meet people at the café, and sit and stare,” said Isabella Cault. "There is usually not much conversation. You look for happiness. Sometimes you even find it.”

小题1:Unemployment in the Netherlands has affected _______

A.about 0.6 million people

B.250,000 people

C.1ess than half of the population

D.one million people小题2:What Nicollete Steggerda said (Para.2) means that ________.

A.what the students learn is more than necessary

B.the students cannot get work after graduation

C.the students’ aim in study is not clear

D.school education is not sufficient小题3:The underlined word ‘‘it” in the last paragraph most probably refers to ________.

A.material enjoyment

B.a sense of expectation

C.a job

D.happiness小题4:Which of the following is TRUE according to the passage?

A.British youths have pity on the unemployed on the Continent.

B.British youths care about unemployment in France and Belgium.

C.British youths show their disappointment over joblessness.

D.British youths have confidence to find work on the Continent.

题型:填空题

一旦发生了送货不能执行或收到时货物损失等问题,应该由()而不是其他人告诉客户有关的消息。

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分泌的毒素能引起肌肉强直性痉挛的厌氧菌为()。

A.艰难梭菌

B.产黑色素类杆菌

C.破伤风梭菌

D.产气荚膜梭菌

E.肉毒梭菌

题型:填空题

公元前770年,周平王将都城东迁,名为“东周”。并分为哪两个时期?

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