尤文肉瘤好发部位为 A.股骨 B.胫骨 C.桡骨 D.骶骨 E.尺骨

题型:多项选择题

问题:

尤文肉瘤好发部位为

A.股骨

B.胫骨

C.桡骨

D.骶骨

E.尺骨

考点:骨外科学主治医师骨外科专业知识骨科学
题型:多项选择题

在平面直角坐标系中,已知直线的参数方程是(为参数);以为极点,轴正半轴为极轴的极坐标系中,圆的极坐标方程为.

(1)写出直线的普通方程与圆的直角坐标方程;

(2)由直线上的点向圆引切线,求切线长的最小值.

题型:多项选择题

压路机的前轮直径是1.2米,轮宽2米,这种压路机前轮滚动一周可前进多少米?压过的面积是多少?

题型:多项选择题

阅读理解。

     Is early childhood education really necessary? Early childhood education primarily focuses on learning

through playing to develop the child's physical, sensory (感觉的), communicational and social development.

Early childhood education has become a concern of the government, who pushes poor children to be formally

trained before they are old enough for the kindergarten.

     There are good reasons for the government to push early childhood education. Studies have shown that

orphan children who did not receive good care and education become developmentally delayed causing failure

in school, and even in life. Further studies show that poor children who take part in Head Start programs are

more prepared for school, less likely to end up in Special Education classes, and are less likely to receive public

help or go to jail.

     There are also negative parts of putting a child in formal education programs too early. Time Magazine online

explains that the younger the child, the less his chances of catching up with first-grade work. I have personally

witnessed many children of my generation who went to Head Start programs became frustrated and bored with

school before they finished high school. Yet parents have been sure that the earlier the child starts school, the

better off he or she is, so they push to start childhood education earlier.

     Actually while early formal education of poor children does show great gains in the early elementary years,

studies also show that this head start is really a"false start", as the gains are lost in middle and high school years.

It seems that environment is a bigger factor on life's success than early education. Head Start programs have

not achieved its original goal in closing the achievement gap in poor and middle school children. Perhaps it is

time to find other ways to close that gap.

1. The purpose of the government valuing early childhood education is _____.

A. to develop the children's communication

B. to give orphaned children good care and education

C. to get the children prepared for the kindergarten

D. to train the children formally and regularly

2. According to the studies which of the following is True?

A. Children with good early education may have a rich life.

B. The orphaned children are usually unhappy in their life.

C. Children without early education can do well at school.

D. Head Start programs are helpful to the poor children.

3. The author's attitude toward early childhood education is _____.

A. puzzling

B. objective

C. indifferent

D. approving

4. The main idea of the last passage is that _____.

A. early childhood education is very necessary

B. Head Start programs have helped the children a lot

C. environment is the most important to life's success

D. better ways should be found to help the poor children

题型:多项选择题

操作三脚架有哪些安全注意事项?

题型:多项选择题

当招标人终止招标的,应及时退还投标人哪些费用()。

A.购买资格预审文件的费用

B.招标文件的费用

C.所收取的投标保证金

D.银行同期贷款利息

E.银行同期存款利息

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