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问题 单项选择题

电弧挺度好，等离子弧能量集中、温度高，能够焊接更细、更薄的工件，甚至可以焊接1mm以下极薄的金属，此种焊接方法为（）。

A．气焊

B．钨极隋性气体保护焊

C．CO2气体保护焊

D．等离子弧焊

答案

参考答案：D

单项选择题

Why save endangered species For the general public, endangered species appear to be little more than biological oddities. A very different perception is gained from considering the issue of extinction in a wider context. The important point is that many major social advances have been made on the basis of life forms whose worth would never have been perceived in advance. Consider the impact of rubber-producing plants on contemporary life and industry: approximately two-thirds of the world’s rubber supply comes from rubberproducing plants and is made into objects as diverse as rubber washers and rubber boots.
The author’s point is made chiefly by

A．acknowledging the validity of two opposing points of view.

B．appealing to the emotions of the audience rather than to their intellects.

C．suggesting a useful perspective for viewing the question raised at the beginning of the passage.

D．trying to discredit the view of an opponent without presenting an alternative hypothesis.

E．(E) generalizing from similar to dissimilar cases.
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填空题

股骨颈骨折的压痛点在（）中点
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