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From good reading we can derive pleasure, companionship, experience, and instruction. A good book may absorb our attention so completely that for the time being we forget our surroundings and even our identity. Reading good books is one of the greatest pleasures in life. It increases our contentment when we are cheerful, and lessens our troubles when we are sad. Whatever may be our main purpose in reading, our contact with good books should never fail to give us enjoyment and satisfaction. With a good book in hand we need never be lonely. Whether the characters portrayed are taken from real life or are purely imaginary, they may become our companions and friends. In the pages of books we can walk with the wise and the good of all lands and all times. The people we meet in books may delight us either because they resemble human friends whom we hold dear or because they represent unfamiliar types whom we are glad to welcome as new acquaintances . Our human friends sometimes may bore us, but friends we make in books need never weary us with their company. By turning the pages we can dismiss them without any fear of hurting their feelings. When human friends desert us, good books are always ready to give us friendship, sympathy and encouragement. One of the most valuable gifts bestowed by books is experience. Few of us travel far from home or have a wide range of experiences, but all of us can lead varied lives through the pages of books. Whether we wish to escape from the seemingly dull realities of everyday life or whether we long to visit some far-off place, a book will help us when nothing else can. To travel by book we need no bank account to pay for our way, no airship or ocean liner or streamlined train to transport us, no passport to enter the land of our heart’s desire. Through books we may get the thrill of hazardous adventure without danger. We can climb lofty mountains or cross the scorching sands of the desert, all without hardship. Indeed, through books the whole world is ours for the asking. The possibilities of our literary experiences are almost unlimited. The beauties of nature, the enjoyment of music, the treasures of art, the triumphs of architecture, the marvels of engineering, are all open to the wonder and enjoyment of those who read.
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【简答题】正弦交流电路中总电压的有效值与电流的有效值的乘积,既包含 ,我们把它叫做视在功率。
【单选题】按钮联锁正反转控制电路的优点是操作方便,缺点是容易产生电源两相短路事故。在实际工作中,经常采用( )正反转控制电路。
A.
按钮联锁
B.
接触器联锁
C.
按钮、接触器双重联锁
D.
倒顺开关
【简答题】正弦交流电路中总电压的有效值与电流的有效值之乘积,即包含()也包含()我们把它叫做()。
【简答题】在 Rt △ BC 中,∠ C=90 °,我们把 锐角 A 的对边与斜边的比叫做∠ A 的正弦, 记作 sinA ,即 sinA= = . sinA = ∠ A的对边/斜边 把∠ A 的邻边与斜边的比叫做∠ A 的 余弦 , 记作 ,即 把∠ A 的对边与邻边的比叫做∠ A 的 正切 , 记作 ,即
【单选题】按钮联锁正反转控制电路的优点是操作方便,缺点是容易产生电源两相短路事故。在实际工作中,经常采用按钮、接触器双重联锁( )控制电路。
A.
点动
B.
自锁
C.
顺序起动
D.
正反转
【单选题】我们把直线的倾斜角 的什么值叫做直线的斜率?
A.
正弦
B.
余弦
C.
正切
D.
余切
【判断题】按钮联锁正反转控制电路的优点是工作安全可靠,操作方便。
A.
正确
B.
错误
【单选题】我们把 叫做弦长
A.
机翼前缘到后缘的连线
B.
机翼前缘到后缘的距离
C.
机翼前缘的直径
D.
机翼上表面到下表面的距离
【多选题】西方对Finance一词的诠释包括( )。
A.
国际货币合作
B.
与资本市场有关的运作机制以及股票等有价证券的价格形成
C.
货币的流通、信用的授予、投资的运作、银行的服务等
D.
货币的事务、货币的管理、与金钱有关的财源等
【简答题】正弦交流电路中总电压的有效值与电流的有效值的乘积,既包含(),也包含(),我们把它叫做()。
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