主页
学科
搜索
账户
常见问题
当前学科：机电一体化技术
题目：
未知类型
振动的激励方式有稳态正弦激振、瞬态激振、脉冲激振三种。()
A、错误
B、正确
答案：
<查看本题扣1积分>
查看答案
答案不对？请尝试站内搜索
推荐知识点:
关于部门统计工作，下列说法中错误的是（）。
企业获利的最佳区域是()
在流动资金借款合同中，中国农业银行可对借款人以下哪些财务指标进行限定，达到风险控制的作用（）.
“F10”临时替代键的作用是？（）
我国四大印章石有（）、（）、（）、（）
“三反”运动的主要内容是反贪污、反受贿、反官僚主义。
KCLF11系列励磁装置灭磁电阻值是转子励磁绕组直流电阻值的（）倍。
高频表面淬火时可能出现哪些废品？怎样防止？
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. What is the best title of the passage?（） In Line 3, the word “boom” could best be replaced by（）. 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 （）. Which of the following were LEAST satisfied with the national economy in the 1950’s?（） The passage states that incom available for spending in the U.S. was greater in 1955 than in 1950 . How much was it （）?
长期鼻饲者可隔天进行口腔护理。