某患者60岁，音乐老师，初戴全口义齿，自感说话易发出哨音，可能原因是（）。 A.下前

胸腔闭式引流瓶的引流管应置于水下面__________cm。

杆号编号写要求应符合下列规定（）。

A.电杆序号应按整个号码填写，不得增添虚零

B.在原有线路上增设电杆时，在增设的电杆上采用前一位电杆的杆号，并在它的下面加上分号

C.原有杆路减少个别电杆时，一般可保留空号，不另重新编杆号

D.水泥杆上编号的最后一个字或号杆牌钉在木杆上的最下沿，宜距地面2m，市区宜为2.5m，特殊地段可酌情提高或降低

E.高桩拉线和撑杆都不应编列号码，填写业主或资产归属单位及建世年份

根据民政部门制订的居家养老服务方案，某地政府将对全区80岁以上的老人发放生活补贴。由此形成的需要被称为( )。

A．规范性需要

B．感觉性需要

C．表达性需要

D．比较性需要

Solving a problem can be broken down into several steps. First, the problem must be identified correctly. Psychologists refer (1) this step as problem representation. For many problems, figuring (2) which information is relevant and (3) is extraneous can be difficult and can interfere (4) arriving at a good solution. Clearly, before a problem can be solved, it must be obvious (5) the problem is, however, this is not as easy (6) it might seem. One obstacle to efficient problem representation is functional fixedness, that is, allowing preconceived notions and even prejudices (7) color the facts. Most people tend (8) see objects and events in certain fixed ways, and by being inflexible in viewing the problem, they may be unable to notice the tools (9) the solution. Once the problem is identified accurately, (10) , the second step consists (11) considering the alternatives for a solution. A common way to evaluate alternatives is to write them (12) and then make a list (13) advantages and disadvantages for each solution. Here again, people may be limited by prior experiences. Often people adopt mental sets (14) lead them to the same problem-solving strategies that were successful for problems (15) the past. Although that can be helpful most (16) the time, sometimes a new situation requires a different strategy. (17) that case, the mental set must be abandoned, (18) new alternatives must be explored.
After the alternatives have been compared, a strategy must be selected (19) among them. One way to avoid becoming mired in the options is (20) try the best option with a view to abandoning it for another (21) the results are unfavorable. This attitude allows many people to move on expeditiously (22) the next step—action. The strategy selected must be implemented and tested. If it solves the problem, no further action is necessary, but if (23) , then the cycle begins again, starting (24) problem identification. By continuing to review the problem (25) repeat the problem-solving steps, the solution can be improved upon and refined.

溢流阀在液压系统中有何功能