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问题 单项选择题

贮丝柜两侧边物料较中间低或者两侧物料一高一低时，可以通过调整控制步进输送机的运行位置，来解决此问题，通常将步进输送机在该柜的两个接近开关位置调整得（）些即可。

A.距离稍近

B.距离稍大

C.对称

D.垂直

答案

参考答案：B

单项选择题 案例分析题

某卸矿站带式输送机栈桥端部设计为悬挑的平面桁架结构，栈桥的倾斜桥面由简支梁系及钢铺板组成，如图所示。架上弦杆及桥面梁系采用轧制型材，桁架腹杆及下弦杆采用热轧无缝钢管，腹杆上端与桁架上弦间以节点板连接，腹杆下端与桁架下弦主管直接焊接连接，全部钢材均采用Q235-B钢，焊条电弧焊使用E43型焊条，焊缝质量等级为二级。

桥面结构中的主梁L--1选用轧制H型钢HN298×149×5.5×8，截面特性：Wx=433×103mm3，Wx=59.4×103mm3，梁腹板与桥面垂直（如下图所示），梁两端为简支。梁L-1承受由次梁L-2传来的竖向集中荷载设计值P=50.3kN（已含结构自重），因考虑与次梁及桥面铺板协同工作，可不计竖向荷载的坡向分力作用。试问，当对L-1作强度验算时，其跨中截面弯曲应力设计值（N/mm2）应与下列何项数值最为接近（）。提示：计算截面无栓孔削弱。

A.82.0

B.163.6

C.175.0

D.184.0
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填空题

another; like; area; those; health; there; angry; sound; look; art; more; way
Why do so many people around the world love Chinese cooking In China, cooking is an (66) , just like music, dance and painting. However, there is (67) than just one kind of Chinese food. Different areas in China have special (68) of cooking because of the differences in weather and geography.
Traditional Chinese doctors believe we need a balance of yin and yang to be (69) Maybe you should eat yang foods, (70) beef when you feel weak or tired. And you should eat yin foods like tofu while you are too stressed out or (71) The Chinese believe people who eat a balanced diet should be healthier than (72) who only eat foods that taste good.
(73) is much more to Chinese food than just taste. Behind many dishes are traditions with deep meaning. One Chinese food tradition is to eat long noodles on your birthday as a symbol of long life. (74) traditional food, yuan xiao, suggests that a family will always stay together. On the Spring Festival, people often eat fish, because yu (75) like the word meaning "more than enough".
From north to south, east to west, people are sure to find some kind of Chinese food to suit their taste and interest.
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