励磁系统在发电机解列，甩负荷时的任务是什么？

以下关于三期梅毒皮肤损害错误的是（）。

A.梅毒树胶肿和结节性梅毒疹是其主要的损害

B.三期梅毒的皮肤损害中近关节结节多见

C.结节性梅毒疹好发于头面部、肩部、背部及四肢伸侧

D.结节性梅毒疹一般无自觉症状

E.梅毒树胶肿的口腔黏膜损害可导致发音及进食困难

决定哪些基因被转录的是（）。

当函数的一阶导数大于0时，反映在经济学中体现的是一个变量增加，另一个变量减少。

One day, a poor boy who was selling goods from door to door to pay his way through school found he had only one thin dime left, and he was hungry. He decided he would ask for a meal at the next house. However, he lost his nerve when a lovely young woman opened the door. Instead of a meal he asked for a drink of water. She thought he looked hungry so she brought him a large glass of milk. He drank it slowly, and then asked, "How much do I owe you" "You don’t owe me anything," she replied. He said, "Then I thank you from my heart. ’
Years later that young woman became critically iii. The local doctors sent her to the big city, where they called in specialists to study her rare disease. Dr. Howard Kelly was called in for the consultation. When he heard the name of the town she came from, he rose immediately and ’went to her room. Dressed in his doctor’s gown he went in to see her. He recognized her at once. He went back to the consultation room determined to do his best to save her life. From that day he gave special attention to the case. After a long struggle, the battle was won.
Dr. Kelly requested the business office to pass the final bill to him for approval. He looked at it and then wrote something on the edge. The bill was sent to her room. She feared to open it, for she was sure it would take the rest of her life to pay for it all. Finally she looked, and something caught her attention on the side of the bill. She read these words: "Paid in full with one glass of milk.\

Dr. Kelly gave special attention to the case mainly because ________.

A．he fell in love with the woman

B．it was a rare disease

C．he was eager to distinguish himself

D．he wanted to repay the woman for her great kindness

41.

Two types of stress:

There are basically two types of stress placed on human beings--physical and mental.
42.

Effects of stress--physical or emotional:

Whether physical or emotional in origin, stress causes the body to react in the same way.
43.

Guilty--useful, though most harmful:

Probably the most harmful of all the stresses is guilt.
44.

Instances no need to feel guilty:

However, many of us as children learned rules that we no longer need.

No one is perfect:

Guilt and the worry that often accompanies this major stress are difficult to eradicate, but people subject to excessive guilt feelings should realize, as simple as it sounds, that no one is perfect. People cannot always be cheerful and helpful to every one they meet. Another good lesson is that mistakes should be forgotten, not lingered over and brought out to examine periodically.
45.

Life with a little stress--significant:

A life without stress, such as retirement with nothing to do, would be boring.
[A] Fat adults should no longer feel guilty about leaving a little food on the plate, a successful businessman need not feel guilty about spending a little too much money on a vacation, nor should he feel guilty that he can combine a business trip to the West Coast with some swimming and golf at an ocean resort. But many people do feel guilty over such apparently innocent actions. Excessive guilt can sour all of life and make life not worth living; it can also cause self-hatred as well as other fears and anxieties that cause all life’s successes to be bittersweet, at best.
[B] Stress from physical activity, if not carried too far, is actually beneficial. Exercise relaxes you and may help forget about mental and emotional stress. But mental stress is almost always bad for you. If mental stress is unrelieved, it can actually cause diseases such as ulcers, migraine headaches, heart problems, or mental illness.
[C] Just as we need a little guilt--to keep us correct and a little worry--to make us plan ahead--we need a little stress to stay interested in life. But when stress begins to bother you, you might as well change your routine. Take your mind off your worries with some physical activity; you may discover a solution you have overlooked before.
[D] Stress is a natural part of everyday life and there is no way to avoid it. In fact, it is not the bad thing it is often supposed to be. A certain amount of stress is vital to provide motivation and give purpose to life. It is only when the stress gets out of control that it can lead to poor performance and ill health.
[E] Some people are not afraid of stress, and such characters are obviously prime material for managerial responsibilities, others lose heart at the first signs of unusual difficulties.
[F] In the first stage, your body prepares to meet the stress. The heartbeat and respiration rates increase, and the pupils of the eyes dilate; the blood sugar level increases, and the rate of perspiration speeds up, while digestion slows down as blood and muscular activity is diverted elsewhere. In the second stage, your body returns to normal and repairs any damage caused by the stressful situation. However, if stress continues, the body cannot repair itself, and the final stage, exhaustion, then begins. If this stage continues, if for example you are frustrated by your work and continue to be frustrated for a long time, physical or emotional damage will occur. These stages of stress reaction are always the same, whether the stress is caused by a cross-country run, a first date, buying a house, or narrowly missing an automobile accident.
[G] This common emotion is useful to have when it helps us to realize that we have, in fact, committed some error, violated our own rules or social rules. If we did not feel guilty, we would never do anything except the things that brought us immediate pleasure-- we’d never obey the law, work, exercise, or even study in school, unless we wanted to do so in the first place. As a person’s conscience develops, guilt feelings become inevitable; guilt is the sorrow we experience when we know we have done something incorrect.