题目内容
某单层工业厂房，设置有两台Q=25/10t的软钩桥式吊车，吊车每侧有两个车轮，轮距4m，最大轮压标准值Pmax=279.7kN，吊车横向小车重量标准值g=73.5kN，吊车轨道的高度hR=130mm。厂房柱距12m，采用工字形截面的实腹式钢吊车梁，上翼缘板的厚度hy=18mm，腹板厚度tw=12mm。沿吊车梁腹板平面作用的最大剪力为V；在吊车梁顶面作用有吊车轮压产生的移动集中荷载P和吊车安全走道上的均布荷载q。 当吊车为中级工作制时，试问，在吊车最大轮压作用下，在腹板计算高度上边缘的局部压应力设计值（N/mm2），与下列何项数值最为接近（）.
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某单层工业厂房，设置有两台Q=25/10t的软钩桥式吊车，吊车每侧有两个车轮，轮距4m，最大轮压标准值Pmax=279.7kN，吊车横向小车重量标准值g=73.5kN，吊车轨道的高度hR=130mm。 厂房柱距12m，采用工字形截面的实腹式钢吊车梁，上翼缘板的厚度hy=18mm，腹板厚度tw=12mm。沿吊车梁腹板平面作用的最大剪力为V；在吊车梁顶面作用有吊车轮压产生的移动集中荷载P和吊车安全走道上的均布荷载q。 假定吊车为重级工作制时，试问，作用在每个车轮处的横向水平荷载标准值(kN)，与下列何项数值最为接近
"Sesame Street" has been called "the longest street in the world". That is because the television program by that name can now be seen in so many parts of the world. The program became one of America’s (36) soon after it was first shown in New York in 1969. In the United States more than six (37) children watch the program regularly. The viewers include more than half the nation’s pre-school children, from every kind of economic, (38) , and geographical group. Tests have shown that children from diverse (39) have benefited from watching it. Those who watch it five times a week learn more than (40) viewers. In the US the program is shown at different hours during the week in order to (41) the number of children who can watch it regularly. Although some educators (42) to certain elements in the program, parents praise it (43) . Many teachers also consider it a great help. (44) . Why has "Sesame Street" been so much more successful than other children’s shows’ Many reasons have been suggested. (45) . This is partly because famous adult stars often appear on it. (46) . The child finds himself learning, and he wants to learn more.
某单层工业厂房，设置有两台Q=25/10t的软钩桥式吊车，吊车每侧有两个车轮，轮距4m，最大轮压标准值Pmax=279.7kN，吊车横向小车重量标准值g=73.5kN，吊车轨道的高度hR=130mm。厂房柱距12m，采用工字形截面的实腹式钢吊车梁，上翼缘板的厚度hy=18mm，腹板厚度tw=12mm。沿吊车梁腹板平面作用的最大剪力为V；在吊车梁顶面作用有吊车轮压产生的移动集中荷载P和吊车安全走道上的均布荷载q。 当吊车为中级工作制时，试问，作用在每个车轮处的横向水平荷载标准值（kN），与下列何项数值最为接近().
某一在主平面内受弯的实腹构件，当构件截面上有螺栓(或铆钉)孔时，下列何项计算要考虑螺栓(或铆钉)孔引起的截面削弱
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