等腰△ABC两边的长分别是一元二次方程x2-9x+18=0的两个解,则这个等腰三

题型:选择题

问题:

等腰△ABC两边的长分别是一元二次方程x2-9x+18=0的两个解,则这个等腰三角形的周长是(  )

A.12

B.15

C.12或15

D.12和15

考点:一元二次方程的解法等腰三角形的性质,等腰三角形的判定
题型:选择题

阅读理解。

     Jeff likes fish very much. He buys some fish and takes it home. When (当……时候) his wife(妻子) sees

the fish, she says to herself, "Good! Now I ask my friends to have lunch, and we can have the fish."They like

eating fish very much. When Jeff comes home in the evening, he can't find the fish and his wife says,"Oh,

your cat eats it."And she gives Jeff some bread for supper. Jeff is not very happy. He takes the cat and his wife

to the shop nearby (附近). Then he says to his wife, "My cat is one kilo and the fish is one kilo, too. The fish is

here. But where is my cat?"

1. What does Jeff like very much?

A. Dogs.

B. Cats.

C. Fish.

D. Apples.

2. Who cooks the fish?

A. Jeff.

B. Jeff's wife.

C. Their friends.

D. No one.

3. Jeff's wife tells Jeff ____.

A. she eats the fish

B. the cat eats the fish

C. her friends eat the fish

D. the man in the shop eats the fish

4. What does Jeff have for supper?

A. Some bread.

B. Some chicken and the fish.

C. The fish.

D. He doesn't eat anything.

5. Who eats the fish?

A. Only Jeff's wife.

B. The cat.

C. Jeff and his wife.

D. Jeff's wife and her friends.

题型:选择题

以吸入麻醉药为主的手术,术中没有知觉的麻醉药最低浓度为()。

A.0.5MAC

B.0.6MAC

C.0.8MAC

D.1.0MAC

E.1.3MAC

题型:选择题

在肺癌病因的分析性研究中,对所有新病人按年龄、性别、居住地点和社会阶层配以对照,然后比较两组吸烟史频率。这是一种( )。

A.前瞻性队列研究

B.病例对照研究

C.临床试验

D.回顾性队列研究

E.横断面研究

题型:选择题

监控软件系统测试过程使用的业务处理文档用处?()

A、测试过程的风险分析、优先级考虑和计划

B、测试过程的风险分析、重点考虑和计划

C、测试过程的风险分析、着重分析和计划

D、测试过程的风险分析、优先级考虑和实施

题型:选择题

适宜的空塔气速与泛点气速之比称为泛点率,根据生产实际综合考虑,泛点率一般选为()。

A、1.2~2.0;

B、0.5~0.8;

C、不大于1/8;

D.0.2~1.0。

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