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【简答题】
某机床主轴由一台笼型电动机带动，润滑油泵由另一台笼型电动机带动。今要求：(1)主轴必须在油泵开动后，开动；(2)主轴要求能用电器实现正反转，并能单独停车；(3)有短路、零压及过载保护。试绘出控制线路。
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皮皮学刷刷变学霸
举一反三
【单选题】回答（49）题 查看材料
A.
Scholars differ in interpreting the purpose of the designs.
B.
The largest picture may have been the sites for special ceremonies.
C.
He called Nazca 'the largest astronomy book in the world'.
D.
A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.
E.
Other scientists are now searching for evidence to prove this.
F.
Seen from the ground， it looks like lines scratched into the earth.
【单选题】回答（47）题 查看材料
A.
Scholars differ in interpreting the purpose of the designs.
B.
The largest picture may have been the sites for special ceremonies.
C.
He called Nazca 'the largest astronomy book in the world'.
D.
A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.
E.
Other scientists are now searching for evidence to prove this.
F.
Seen from the ground， it looks like lines scratched into the earth.
【单选题】请在第____处填上正确答案。
A.
Scholars differ in interpreting the purpose of the designs．
B.
The largest picture may have been the sites for special ceremonies．
C.
He called Nazca“the largest astronomy book in the world”
D.
A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs．
E.
Other scientists are now searching for evidence to prove this．
F.
Seen from the ground，it looks like lines scratched into the earth．
【单选题】回答（50）题 查看材料
A.
Scholars differ in interpreting the purpose of the designs.
B.
The largest picture may have been the sites for special ceremonies.
C.
He called Nazca 'the largest astronomy book in the world'.
D.
A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.
E.
Other scientists are now searching for evidence to prove this.
F.
Seen from the ground， it looks like lines scratched into the earth.
【单选题】回答（48）题 查看材料
A.
Scholars differ in interpreting the purpose of the designs.
B.
The largest picture may have been the sites for special ceremonies.
C.
He called Nazca 'the largest astronomy book in the world'.
D.
A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.
E.
Other scientists are now searching for evidence to prove this.
F.
Seen from the ground， it looks like lines scratched into the earth.
【简答题】Men differ from brutes in that they can think and speaks.
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