男性，70岁。反复咳嗽咳痰30年，双下肢水肿2年，1天前咳嗽咳痰加重，黄色黏稠痰，口

Public speaking fills most people with dread. Humiliation is the greatest fear; self-exposure and failing to appeal to the audience come a close second. Women hate it most, since girls are pressurized from an early age to be concerned with appearances of all kinds.

Most people have plenty of insecurities, and this seems like a situation that will bring them out. If parents, teachers or peers mocked your foibles as a child, you fear a repeat. If you were under pressure to be perfect, you are terrified of failing in the most public of ways.

While extroverts will feel less fear before the ordeal, it does not mean they will necessarily do it better. Some very shy people manage to shine. In fact, personality is not the best predictor of who does it well. Regardless of what you are like in real life, the key seems to be to act yourself.

Actual acting, as in performing the scripted lines of a character other than yourself, does not do the job. While politicians may limit damage by having carefully rehearsed, written screeds to speak from, there is always a hidden awareness among the audience that the words might not be true.

Although, as Earl Spencer proved at his sister Princess Diana’s funeral, it is possible both to prepare every word and to act naturally, a script rarely works and it is used as a crutch by most people. But, being yourself doesn’t work either. If you spoke as if you were in your own kitchen, it would be too authentic, too unaware of the need to communicate with an audience.

I remember going to see British psychiatrist RD Laing speak in public. He behaved like a seriously odd person, talking off the top of his head. Although he was talking about madness and he wrote on mental illness, he seemed to be exhibiting rather than explaining it.

The best psychological place from which to speak is an unselfconscious self-consciousness, providing the illusion of being natural. Studies suggest that this state of "flow", as psychologists call it, is very satisfying. Whether in normal life or making speeches, the key is to remind yourself that, contrary to what your teachers or parents may have implied, your best is good enough. In the zone, a strange place of authentic falsehood and shallow depth, play is possible.

The example of the British psychiatrist in Paragraph 6 shows a failure in ().

A. showing modesty in public

B. talking about one’s own trade

C. presenting the topic logically

D. communicating with the audience

关于滤线栅使用注意事项的叙述，错误的是（）

A.将滤线栅置于焦点和被照体之间

B.焦点到滤线栅的距离与栅焦距相等

C.X线中心线对准滤线栅的中心

D.原射线投射方向与滤线栅铅条排列间隙平行

E.原发X线与滤线栅铅条平行

接地装置宜采用钢材，导体截面应符合稳定和机械强度的要求。接地体顶面埋没深度应符合设计规定，但应()，在地下不得采用裸铝导体作为接地体或接地线。

A.大于0.4m

B.大于0.5m

C.大于0.6m

D.大于0.7m

卒厥