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（单选题）本工程所采用的永久性普通螺栓紧固应牢固、可靠，外露螺纹不应少于（）扣。A．1B．2C．3D．4
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Section A
Sometimes things happen to you that seem horrible, painful, and unfair at first, but upon reflection you find that without overcoming those obstacles you would never have realized your potential, strength, willpower or heart.
【46】Illness, injury, lost moments of true greatness, and sheer stupidity all occur to test the limits of your soul.【47】Without these small tests, whatever they may be, life would be like a smoothly paved road to nowhere. It would be safe and comfortable, but dull and utterly pointless.
【48】If someone hurts you, betrays you, or breaks your heart, forgive them, for they have helped you learn about trust and the importance of being cautious to whom you open your heart.
Make every day count. Appreciate every moment and take from those moments everything that you possibly can, for you may never be able to experience them again.
【49】Talk to people that you have never talked to before, and listen to what they have to say. You can make of your life anything you want it to be.
【50】Create your own life and then go out and live it with absolutely no regrets.
(46)
甲公司向乙公司购买货物。以一张丙公司为出票人的汇票支付赁款。乙公司要求甲公司提供担保，甲公司请丁公司为该汇票作保证。丁公司在汇票背书栏签注：若该汇票出票真实，本公司愿意保证。后经了解丙公司实际并不存在。丁公司对该汇票承担的责任是（）。
创伤性应激障碍的病程特点是（）。
小红今年5岁，测得心理年龄4．5岁，那么她的IQ是（）。
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