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The economy of the United states after 1952 was the econnomy of a well-fed,almost fully employed people. Despit occasional alarms, the country escaped any postwar depression and lived in a state of boom. A n economic survey of the year 1955, a typical year of the 1950’s, may be typical as illustrating the rapid economic growth of the decade. The national output was value at 10 percent above that of 1954 (1955 output was estimated at 392 billion dollars). The production of manufacturers was about 40 percent more than it had averaged in the years immediately following World War 2. The country’s business spent about 30billion dollars for new factories and machinery. National income available for spending was almost a third greater than it had been it had been in 1950. Consumers spent about 256 billion dollars; that is about 700 million dollars a day ,or about twenty-five million dollars every hour , all round the clock. Sixty-five million people held jobs and only a little more than two million wanted jobs but could not find them . Only agriculture complained that it was not sharing in the room. To some observers this was an ominous echo of the mid-1920’s . As farmer’s shre of their products declined , marketing costs rose. But there were , among the observers of the national economy, a few who were not as confident as the majority . Those few seemed to fear that the boom could not last and would eventually lead to the oppsite-depression. It can be inferred the national from the passage that most people in the United States in 1955 viewed the national economy with an air of （）.
数字化彩色多普勒超声仪性能高、功能多的关键技术是（）。
在LKJ系统中当系统故障时，数字量输入/出插件将产生一个110V的信号给过压抑制板和显示器，使显示器蜂鸣器发出报警信号，使过压抑制板延时（）后产生紧急停车信号。
测量上肢血压时，袖带的下缘距肘窝2～3cm，松紧度以能放入一指为宜。
如何在所有的新工程图文件中能包含所设定的草图符号？（）
中气相色谱法测定公共场所空气中甲醛时，称取一定量的2，4-二硝基苯肼于容量瓶中，用（）稀释至刻度线，配成2，4-二硝基苯肼溶液。
用于肝肾两虚，头晕目花，须发早白，高脂血症的是（）。
关于成本管理责任体系的内容，下列选项中，错误的是（）。
《中华人民共和国消防法》于什么时间通过并实施的？其制定宗旨是什么？
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