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Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by （）
A . corrosion on the gears
B . excessive gear speed
C . dirt in the oil
D . misalignment of the gear
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间接叩诊（indirect percussion）
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直接叩诊（direct percussion）
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叩诊（percussion）
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A balanced diet is essential for healthy __________.
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A healthy man is not _____ of his breathing.
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A longer _________ of healthy years will lead to greater wealth and prospects for happiness.
A、 accident
B、defect
C、damage
D、defeat
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Early to bed and early to rise (makes, make) a man healthy, wealthy and wise.
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I believe friendship is an essential element of making a healthy, ________ life.
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A tender tooth is ______.
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If someone’s skin is white and healthy, we say he or she has a ____ complexion.
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They are conducting a survey on eating _____ in China and will give some advice on healthy dieting at the end of this year.
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The core values of a company will help to create a healthy work environment and attract more talented people.
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What is NOT mentioned in this unit as a way to keep physically healthy?
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Regular riding practices can help people maintain a healthy body weight.
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n____ vt.give a person orother living thing the food and other substances they need in order tolive,grow,and stay healthy 滋养;给 ... 营养
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Experts say walking is one of the best ways for a person to remain healthy.
A．stay
B．preserve
C．maintain
D．reserve
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Which of the following is a healthy eating habit.
A．Eating as little as possible.
B．Eating no breakfast.
C．Eating three regular meals a day.
D．Eating no lunch.
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A moment's drilling by the dentist may make us nervous and upset. Many of us cannot stand pain. To avoid the pain of a drilling that may last perhaps a minute or two, we demand the "needle"—a shot of novocaine—that deadens the nerves around the tooth.
Now it's line that the human body has developed its millions of nerves to be highly aware of what goes on both inside and outside of it. This helps us adjust to the world. Without our nerves—and our brain, which is a bundle of nerves—we wouldn't know what's happening. But we pay for our sensitivity. We can feel pain when the slightest thing is wrong with any part of your body. The history of torture is based on the human body being open to pain.
But there is a way to handle pain. Look at the Indian fakir who sits on a bed of nails. Fakirs can put a needle right through an arm. And feel no pain. This ability that some humans have developed to handle pain should give us ideas about how the mind can deal with pain.
The big thing in withstanding pain is our attitude toward it. If the dentist says, "This will hurt a little", it helps us to accept the pain. By staying relaxed, and by treating the pain as an interesting sensation, we can handle the pain without falling apart. After all, although pain is an unpleasant sensation, it is still a sensation, and sensations are the stuff of life.
The purpose of this passage is mainly to tell us ______.
A．that pain is good for us
B．to stop taking the "needle" at the dentist's
C．how to handle pain
D．how to avoid torture
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Most children with healthy appetites are ready to eat almost anything that is offered to them and a child rarely dislikes food【C1】______it is badly cooked.
The【C2】______a meal is cooked and served is most important and an【C3】______served meal will often improve a child's appetite. Never ask a child【C4】______he likes or dislikes a food and never【C5】______likes and dislikes in front of him or allow【C6】______else to do so. If the father says he hates fat meat or the mother【C7】______vegetables in the child's hearing he is【C8】______to copy this procedure. Take it【C9】______granted that he likes everything and he probably【C10】______. Nothing healthful should be omitted from the meal because of a【C11】______dislike. At meal times it is a good【C12】______to give a child a small portion and let him【C13】______back for a second helping rather than give him as【C14】______as he is likely to eat all at once. Do not talk too much to the child【C15】______meal times, but let him get on with his food, and do not【C16】______him to leave the table immediately after a meal or he will【C17】______learn to swallow his food【C18】______he can hurry back to his toys. Under【C19】______circumstances must a child be coaxed(哄骗)【C20】______forced to eat.
【C1】
A．if
B．until
C．that
D．unless
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A healthy, active lifestyle. helps to improve and maintain mental health. Which one of the following is an example of an improvement in mental health？（)
A．A.Better stamina to keep goin
B．B.More skills to carry out specific physical activities.
C．C.You live longer
D．D.More able to think positively
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A healthy lifestyle. can be guite important to modiern life.
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A healthy 28-year-old woman stands up from a supine position. Moving from a supine to a standing position results in a transient decrease in arterial pressure that is detected by arterial baroreceptor
A．Mean circulatory filling pressure↑, Strength of cardiac contraction↑, Sympathetic nerve activity↑
B．Mean circulatory filling pressure↓, Strength of cardiac contraction↑, Sympathetic nerve activity↑
C．Mean circulatory filling pressure↓, Strength of cardiac contraction↓, Sympathetic nerve activity↑
D．Mean circulatory filling pressure↓, Strength of cardiac contraction↓, Sympathetic nerve activity↓
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répercussion f（）
A．分配；分布
B．打击，撞击
C．反响，影响
D．谴责，非难
