问题
单项选择题
图15-15为摩擦型高强螺栓连接，预拉力P=110kN，弯矩M使受力最大的螺栓1产生的拉力Nt1=60kN＜
=0.8P，这时螺栓1的拉力为（）。
A．等于170kN
B．低于110kN
C．高于110kN较多
D．螺栓内原预拉力基本不变
答案
参考答案：D
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图15-15为摩擦型高强螺栓连接，预拉力P=110kN，弯矩M使受力最大的螺栓1产生的拉力Nt1=60kN＜=0.8P，这时螺栓1的拉力为（）。
A．等于170kN
B．低于110kN
C．高于110kN较多
D．螺栓内原预拉力基本不变
参考答案：D
阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中，选出可以填入 空白处的最佳选项，并在答题卡上将该项涂黑。 I believe in my mother. My belief began when I was just a kid, when I 41 becoming a doctor. My mother was a 42 . Through her work, she observed that 43 people spent a lot more time 44 than they did watching television. She announced that my brother and I could only watch two to three 45 TV programs during the week. With our free time, we had to read two books each week from the Detroit Public Library and 46 written book reports to her. She would mark them up with check markers and underline the 47 parts. Years later we realized her marks were a 48 . My mother was illiterate(文盲). Although we had no money, 49 the covers of those books, I could go anywhere, do anything and be anybody. When I entered high school, I was an A-student, but not for 50 . I wanted the fancy clothes. I wanted to hang about with the guys. I went from being an A-student to a B-student and to a C-student, but I didn’t 51 . I was cool. One night my mother came home after her several jobs and I 52 about not having enough Italian knit shirts. She said, “Okay, I’ll give you the money I 53 this week by rubbing floors and cleaning bathrooms and you can buy the family food and pay the bills. With 54 left over, you can have all that you want.” I was very 55 with that arrangement. But once I got through 56 money, there was nothing left. I realized my mother was a financial genius to be able to keep a(n) 57 over our heads and any kind of food on the table. I was also 58 that immediate satisfaction wasn’t going to get me anywhere. Success 59 intellectual(知识上的) preparation. I went back to my studies and became an A-student again, and 60 I realized my dream and I became a doctor.
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