题目内容
晶闸管既可以控制电流的通断，又可以放大电流。( )
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晶闸管的通态平均电压越小越好。( )
Since we are social beings, the quality of our lives depends in Large measure on our interpersonal relationships. One strength of the human condition is our tendency to give and receive support from one another under stressful circumstances. Social support consists of the exchange of resources among people based on their interpersonal ties. Those of us with strong support systems appear better able to cope with major life changes and daily hassles (困难). People with strong social ties live longer and have better health than those without such ties. Studies over a range of illnesses, from depression to heart disease, reveal that the presence of social support helps people fend off (挡开) illness, and the absence of such support makes poor health more likely. Social support cushions stress in a number of ways. First, friends, relatives, and co-workers may let us know that they value us. Our self-respect is strengthened when we feel accepted by others despite our faults and difficulties. Second, other people often provide us with informational support. They help us to define and understand our problems and find solutions to them. Third, we typically find social companionship supportive. Engaging in leisure-time activities with others helps us to meet our social needs while at the same time distracting (转移……注意力)us from our worries and troubles. Finally, other people may give us instrumental support, a financial aid, material resources, and needed services- that reduces stress by helping us resolve and cope with our problems. Social companionship is beneficial in that ______.
警铃、轿厢内电话属于电梯的标准功能之一。( )
电桥法测量绕组直流电阻时，应先接通检流计再接通电源，测量完毕应先断开电源，再断开检流计。( )
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