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问题 单项选择题

已知某分部工程双代号网络图进度计划如下图所示，其关键线路为（）。

A．1—2—4—7

B．1—2—3—6—7

C．1-2—3—5—7

D．1—3—6—7

答案

参考答案：C

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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单项选择题 B型题

PNF操作技术中“特点为抵抗阻力做交替等长收缩，不产生运动”属于（）

A.等张组合

B.节律性起始

C.拮抗肌动态反转

D.拮抗肌节律性稳定

E.拮抗肌稳定性反转
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