| In the 1920s demand for American farm
products fell, as European countries began to recover from World War I and
instituted austerity (紧缩) programs to reduce their imports. The result was a
sharp drop in farm prices. This period was more disastrous for farmers than
earlier times had been, because farmers were no longer self-sufficient. They
were paying for machinery, seed, and fertilizer, and they were also buying
consumer goods. The prices of the items farmers bought remained constant, while
prices they received for their products fell. These developments were made worse
by the Great Depression, which began in 1929 and extended throughout the
1939s. In 1929, under President Herbert Hoover, the Federal Farm Board was organized. It established the principle of direct interference with supply and demand, and it represent A. The impact of the Great Depression. B. The shrinking of overseas markets. C. The destruction caused by WWI. D. The increased exports of European countries. 热门试题:[判断题]反复呕吐造成电解质损失最多的是钾。（ ）
A.正确 B.错误 [单项选择]显示器显示图像的清晰程度，主要取决于显示器的（）。
A. 对比度 B. 分辨率 C. 亮度 D. 尺寸 E. 大小 [单选题]AC001输出为标准信号的传感器称为( )。
A.调节器 B.变送器 C.接触器 D.传感器 [判断题]铁路货车车体部分的运用限度表规定：铁路敞车车体外胀，重车须≤150mm。
A.正确 B.错误 [判断题]生产经营单位的从业人员有依法获得安全生产保障的权利，并应当依法履行安全生产方面的义务。
A.正确 B.错误 [单选题]使用高压验电器前，除检查其外观、电压等级、试验合格期外，还应（ ）。( )
A.自测发光声 B.自测音响 C.直接验电 D.在带电设备上测试其好坏 [判断题] 起重工作应由工作负责人指挥,明确分工;起重指挥信号应简明、统一、畅通。重大物件的起重、搬运工作应由有经验的专人负责,作业前应进行安全技术交底,使全体人员熟悉起重搬运方案和安全措施。
A.正确 B.错误 [判断题]在灭火战斗中,积极抢救人命是指挥员优先考虑和竭力实现的首要任务。( )
A.正确 B.错误 [单项选择]代谢性白内障不包括（）
A. 糖尿病性白内障 B. 半乳糖性白内障 C. 手足抽搦性白内障 D. 低钾性白内障 E. 低钙性白内障 [多选题]垄断条件下竞争的特点有( )。
A.竞争的目的是为了获得高额垄断利润,并不断巩固扩大巳有的垄断地位 B.竞争手段更加多样 C.竞争更为激烈、破坏性更大 D.竞争的范围遍及各个领域和部门 [多选题]社会工作者刘冰强调组员之间的互动，通过组织小组活动及组员之间的互动，发掘组员的自身潜能，增强他们社会交往与社会生活的信心、知识和能力。她在这个过程中使用小组工作的一个重要模式，符合这个模式实施原则的是（ ）。
A.积极参与原则 B.全民主动原则 C.开放性的互动原则 D.平等性的互动原则 E.面对面的互动原则 [简答题]内伤发热概述
[单选题]物料提升机( )应装设有联锁装置的安全门,同时采用断绳保护装置或安全停靠装置。
A. 安全口 B. 通道门 C. 上料口 D. 下料口 [单项选择] 通读下面的短文，掌握其大意。然后从每小题的四个选择项中选出可填入相应空白处的最佳选项。
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