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《压力容器安全技术监察规程》中规定，钢制压力容器受压元件的强度计算，以及许用应力的选取，应按照BG150、GB151、GB12337、JB4732等标准的有关规定执行，请说明这些标准的名称。

答案

参考答案：

GB150：《钢制压力容器》

GB151：《钢制管壳式换热器》

GB12337：《钢制球形储罐》

JB4732：《钢制压力容器-应力分析标准》

单项选择题

不适合婴儿活动的公共场所是（）。

A、居住所在地的物业小区 

B、户外活动的公园 

C、儿童游乐场 

D、办公大楼
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单项选择题

Ants first captured the attention of software engineers in the early 1990s. A single ant cannot do much on its own, but a group of ants (52) can solve complex problems. That inspired people like Marco Dorigo, who is one of the founders of a (53) known as group intelligence.

Ants are good at choosing the shortest possible route between a food (54) and their nest. This reminds us of a classic computational travelling-salesman problem. Given a list of cities and their (55) apart, the salesman must find the shortest route needed to visit each city once. As the number of cities (56) , the problem gets more complicated.Ants solve their own problem using chemical signals called pheromones (信息素), when an ant finds food, she takes it back to the nest, (57) a pheromone trail that will attract others. The more ants that (58) the trail, the per it becomes. (59) , the pheromones evaporate (挥发) quickly, so once all the food has been collected, the trail soon goes cold. This rapid evaporation means long trails are less (60) than short ones, all else being equal. Pheromones thus turn the (61) intelligence of the individual ants into something more powerful.

54().

A. range

B. source

C. chain

D. origin
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