什么是塔曼断言？

Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour’s flight one of the scientists wrote in his book, "Look here for probable metal. " Scientists in another airplane, flying over a mountain area, sent a message to other scientists on the ground, "Gold possible. " Walking across hilly ground, four scientists reported. "This ground should be searched for metal." From an airplane over a hilly wasteland a scientist sent back by radio one word: "Uranium."

None of the scientists had X-ray eyes: they had on magic powers of looking down below the earth’s surface, They were merely putting to use one of the newest methods of locating minerals in the ground, using trees and plants as signs that certain minerals may lie beneath the ground on which the trees and plants are growing.

This newest method of searching for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow on the surface.

At Weston Bar Greek, a brook six thousand feet high in the mountains of British Columbia, Canada, a mineral search group gathered bags of tree seeds. Boxes were filled with small branches from the trees. Roots were dug and put into boxes. Each bag and box was carefully marked. In a scientific laboratory the parts of the forest trees were burned to ashes and tested. Each small part was examined to learn whether there were minerals in it.

Study of the roots, branches, and seeds showed no silver. But there were small amounts of gold in the roots and a little less gold in the branches and seeds. The seeds growing nearest to the tree trunk had more gold than those growing on the ends of the branches.

Which of the following is not mentioned as part of tree that can help find minerals()

A．Leaves.

B．Roots.

C．Branches.

D．Seeds.

阅读下列材料：

材料：我们多次说过，我国的经济，到建国一百周年时，可能拉近发达国家的水平。我们这样说，根据之一，就是在这段时间里，我们完全有能力把教育搞上去，提高我国的科技水平，培养出数以亿计的各级各类人才。我们国家，国力的强弱，经济发展后劲的大小，越来越取决于劳动者的素质，取决于知识分子的数量和质量。一个十亿人口的大国，教育搞上去了，人才资源的巨大优势是任何国家比不了的。有了人才优势，再加上行进的社会主义制度，我们的目标就有把握达到。现在小学一年级的娃娃，经过十几年的学校教育，将成为开创21 世纪大业的生力军。中央提出要以极大的努力抓教育，并且从中学抓起，这是有战略眼光的一着。如果现在不向全党提出这样的任务，就会误大事，就要负历史的责任。—— 邓 * * 1985 年5 月在全国教育工作会议讲话

（1 ）在20 世纪80 年代初，针对我国的教育状况，邓 * * 提出了什么教育方针？

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（2）在20世纪90年代，党和政府实施了“科教兴国“的发展战略，这一战略的内容有哪些？

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（3）《中华人民共和国义务教育法》是何时颁布的？

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（4）结合今天的教育现状谈谈你对教育的看法。

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女性，40岁，3年前双手指关节肿痛，经对症治疗后症状缓解，以后虽有关节痛，但不影响正常工作。2个月前无明显诱因发热（38℃左右），感乏力、气短，咳嗽不明显。查体：双手中指近指关节梭形肿胀，双腕功能略差，有压痛。右肘关节不能完全伸直，伸面有一个1．0cm×1．5cm皮下结节，无压痛。胸片示左侧胸腔中等量积液，肺纹理稍粗，血沉67mm（第1小时末），CRP增高，RF高滴度阳性

考虑到该病的可能性（）

A.RF高滴度阳性

B.CRP增高

C.血沉增快

D.皮下无痛性结节

E.双侧胸腔积液

电气设备漏电或接地都可能产生电火花。

哪些情形之一的禁止结婚（）。

A、直系血亲和三代以内旁系血亲。

B、患有医学上认为不应当结婚的疾病。

C、夫妻双方不实行计划生育义务的