离心选矿机按转鼓数分为当转鼓和双转鼓两种,按转鼓锥度又有单锥度、双锥度和()之分。

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问题:

离心选矿机按转鼓数分为当转鼓和双转鼓两种,按转鼓锥度又有单锥度、双锥度和()之分。

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In the 1960s, medical researchers Thomas Holmes and Richard Rahe developed a checklist of stressful events. They appreciated the tricky point that any major change can be stressful. Negative events like "serious illness of a family member" were high on the list, but so were some positive life-changing events, like marriage. When you take the Holmes-Rahe test you must remember that the score does not reflect how you deal with stress—it only shows how much you have to deal with. And we now know that the way you handle these events dramatically affects your chances of staying healthy.

By the early 1970s, hundreds of similar studies had followed Holmes and Rahe. And millions of Americans who work and live under stress worried over the reports. Somehow, the research got boiled down to a memorable message. Women’s magazines ran headlines like "Stress causes illness. " If you want to stay physically and mentally healthy, the articles said, avoid stressful events.

But such simplistic advice is impossible to follow. Even if stressful events are dangerous, many—like the death of a loved one—are impossible to avoid. Moreover, any warning to avoid all stressful events is a prescription (处方)for staying away from opportunities as well as trouble. Since any change can be stressful, a person who wanted to be completely free of stress would never marry, have a child, take a new job or move.

The notion that all stress makes you sick also ignores a lot of what we know about people. It assumes we’re all vulnerable (脆弱的) and passive in the face of adversity (逆境). But what about human initiative and creativity Many come through periods of stress with more physical and mental vigor than they had before. We also know that a long time without change or challenge can lead to boredom, and physical and mental strain.

The studies on stress in the early 1970’s led to ().

A. widespread concern over its harmful effects

B. great panic over the mental disorder it could cause

C. an intensive research into stress-related illnesses

D. popular avoidance of stressful jobs

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运动的完成,除了需要运动系统外,还需要           的控制和调节,运动中提供的有机物和能量的供应需要              系统、气体代谢需要              系统、运输物质需要             等系统的配合。(4分)

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经、带、胎、产诸病,凡出现肾阴不足之证,其治则为()

A.壮水之主,以制阳光

B.滋肾养阴,填精益髓

C.益火之源,以消阴翳

D.补益肾气,滋阴潜阳

E.以上都不对

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取保候审属于刑事司法工作中的( )。

A.刑事侦查工作

B.羁押工作

C.执行刑罚工作

D.刑事强制工作

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为鼓励顾客购买更多物品企业给那些大量购买产品的顾客的一种减价称为什么?

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