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阅读下文,回答题 On November 19, 1863, Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery. The Civil War was still going on. There was much criticism of Presi-dent Lincoln at the time. He was not at all popular. He had been invited to speak at Gettysburg on-ly out of politeness. The principal speaker was to be Edward Everett, a famous statesman and speaker of the day. Everett was a handsome man and very popular everywhere. It is said that Lincoln prepared his speech on the train while going to Gettysburg. Late that night, alone in his hotel room and tired out, he again worked briefly on the speech. The next day Everett spoke first. He spoke for an hour and 57 minutes. His speech was a perfect example of the rich oratory of the day. Then Lincoln rose. The crowd of 15,000 people at first paid little attention to him. He spoke for only nine minutes. At the end there was little applause. Lincoln turned to a friend and remarked,"I have failed again". On the train back to Washington, he said sadly, "That speech was a fiat failure, and the people are disappointed". Some newspapers at first criticized the speech, but little by little as people redid the speech they began to understand better. (76) They began to appreciate its simplicity and its deep mean-ing. It was a speech which only Abraham Lincoln could have made. Today, every American school child learns Lincoln' s Gettysburg Address by heart. Now eve-ryone thinks of it as one of the greatest speeches ever given in American history. In 1863, Abraham Lincoln was__________. 查看材料
A.
very critical
B.
unpopular
C.
very popular
D.
very courteous
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【简答题】加馈电阻制动又称为()电阻制动。
【单选题】MM420西门子变频器参数P1121如果设置为20,则变频器从20HZ制动至0HZ需要的时间是( )。
A.
20S
B.
10S
C.
4S
D.
8S
【判断题】( )对于虚拟局域网,由一个站点发送的广播信息帧只能发送到具有相同虚拟网号的其他站点,而其它虚拟局域网的站点则接收不到该广播信息帧。
A.
正确
B.
错误
【单选题】在型号为MM420的西门子变频器参数设置中,参数P0700设定的是______________ 。
A.
命令源
B.
频率源
C.
参数访问的权限
D.
基准频率
【单选题】车削圆锥角为 80 °的短外圆锥时,应采用( )加工。
A.
.转动小滑板法
B.
.偏移尾座法
C.
.仿形法
D.
.铰圆锥法
【单选题】西门子变频器参数有_____个访问级。
A.
2
B.
3
C.
4
D.
6
【单选题】MM420西门子变频器参数P1120如果设置为20,则变频器从0Hz启动输出至20Hz需要的时间是( )。
A.
20S
B.
10S
C.
4S
D.
8S
【判断题】如果将西门子变频器参数P0003设置成3,表示显示参数级别为专家级。
A.
正确
B.
错误
【单选题】常用的进口制动液有DOT3和()
A.
DOT4
B.
DOT1
C.
DOT2
【多选题】西门子变频器参数 P0003 用于定义参数的访问级,有哪4个用户访问级
A.
标准级
B.
扩展级
C.
专家级
D.
维修级
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