在如图所示的匀强磁场中,已经标出了电流I和磁场B以及磁场对电流作用力F三者的方向

题型:选择题

问题:

在如图所示的匀强磁场中,已经标出了电流I和磁场B以及磁场对电流作用力F三者的方向,其中错误的是(  )

A.

B.

C.

D.

考点:磁场对通电导线的作用:安培力、左手定则
题型:选择题

下列商业银行的理财顾问服务环节中,顺序排在“基础规划”之后的是()。

A.客户资产评估

B.资产管理目标分析

C.风险分析

D.实施计划

题型:选择题

美国科学家用有机分子和球形笼状分子C60首次制成了“纳米车”(如图),每辆“纳米车”是用一个有机分子和4个球形笼状分子“组装”而成。“纳米车”可以用来运输单个的有机分子,生产复杂的材料和药物,成为“纳米生产”中的有用工具。下列说法正确的是

A.我们可以直接用肉眼清晰地看到这种“纳米车”的运动

B.“纳米车”的诞生,说明人类操纵分子的技术进入一个新阶段

C.C60是一种新型化合物

D.C60熔点比金刚石熔点高

题型:选择题

阅读理解。

     Jim suffered heart problems. In conversation he expressed little joy and it seemed that his life was

drawing to a close.

     When his heart problems led to operation, Jim went through it successfully, and a full recovery was

expected. Within days, however, his heart was not beating properly. Jim was rushed back to operation,

but nothing was found to explain the cause of his illness. He died on the operating table on the day before

his 48th birthday.

     Dr. Bruce Smoller, a psychologist, had had many conversations with him, and the more he learned, the

stranger he realized Jim's case was. When Jim was a child, his father, a teacher, suffered a heart attack and

stayed home to recover. One morning Jim asked his father to look over his homework, promising to come

home from school at noon to pick it up. His father agreed, but when Jim returned his father had died. Jim's

father was 48.

     "I think all his life Jim believed he killed his father," Dr. Smoller says. "He felt that if he had not asked him

to look at his homework, his father would have lived. Jim had been troubled by the idea. The operation was

the trial (判决) he had expected for forty years." Smoller believes that Jim willed himself not to live to the age

of 48.

     Jim's case shows the powerful role that attitude plays in physical health, and that childhood experiences

produce far-reaching effect on the health of grown-ups. Although most cases are less direct than Jim's,

studies show that childhood events, besides genes, may well cause such midlife diseases as cancer, heart

disease and mental illness.

1. Jim was sent back to operation because _____. [ ]

A. his heart didn't work well

B. he expected a full recovery

C. his life was drawing to a close

D. the first one wasn't well performed

2. What made Dr. Smoller feel strange about Jim's case? [ ]

A. Jim died at a young age.

B. Jim died on the operating table.

C. Both Jim and his father died of the same disease.

D. Jim's death is closely connected with his father's.

3. From Smoller's words, we can infer that _____. [ ]

A. Jim's father cared little about his study

B. Smoller agreed that Jim did kill his father

C. Jim thought he would be punished some day

D. Smoller believed Jim wouldn't live to the age of 48

4. Which of the following could have strong effect on one's physical health according to the text?

    a. One's genes.

    b. One's life in childhood.

    c. One's physical education.

    d. The date of one's birthday.

    e. The opinions one has about something. [ ]

A. a, b, d

B. a, b, e

C. a, c, e

D. b, c, d

题型:选择题

生态城市的内涵有哪些?

题型:选择题

何谓直流电和直流电疗法?直流电是经过什么途径进入人体的?

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