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直流稳压电源电路中，辅助稳压电源的目的是避免输入端电压波动对（）和调整管工作产生不良的影响。

甲状腺功能减低症的常见病因有______、______、______、______、______、______。

练习曲线

（）以下哪四个本子，是将“玄”字改为“元”字避讳？

旧城区中严重影响城市消防安全的企业，对于无市政消火栓或消防给水不足、无消防车通道的区域，可根据具体条件修建容量为（）的消防蓄水池。

现代营销战略的核心可以称为STP营销，指（　）。

直方图的观察分析分为形状观察分析和（）

Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it， and before any research can be done it is necessary to have expensive scientific apparatus and large， elaborately equipped laboratories. Actually， this is not so. （6） It is a simple， organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First， you select the problem you would like to solve， then you list at least ten reasons why it has not been solved. （7） It takes just as much effort to solve a useless problem as a useful one. （8） After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution， you then use the same procedure as in solving a crossword puzzle.（9）In the solution of the remaining obstacles you may need some simple apparatus， but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once， we were out. （10）If we are going to make progress， we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure. 6.（） 7.（） 8.（） 9.（） 10.（）

关于聚乙烯给水管道的电熔连接施工，下列描述不正确的是（）。

如果投资项目每期现金流量不相等，采用内含报酬率方法进行决策分析时要使用逐次测试法。( )