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【单选题】
要制造直径25mm的螺栓，要求整个截面上具有良好的综合力学性能，用A.
45钢经正火处理
B.
60Si2Mn经淬火和中温回火
C.
40Cr经调质处理
D.
20Cr渗碳、淬火和低温回火
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皮皮学刷刷变学霸
举一反三
【单选题】The meaning of the underlined word 'identical' is ______.
A.
just the opposite
B.
a bad imitation
C.
just the same
D.
a different size
【单选题】船政学堂在办学过程中养学生高度的民族使命感、强烈的（ ）精神、奋进的创新与变革精神、学以致用、知行合一的成才观念。
A.
变革
B.
爱国主义
C.
英勇无畏
D.
杀敌制胜
【单选题】What would a six-month-old baby love to do?
A.
Smile at people.
B.
Grawl on the floor.
C.
Imitate actions.
D.
Play simple games.
【简答题】Directions: In this section, you are going to read a passage with ten statements attached to it. Each statement contains information given in one of the paragraphs. Identify the paragraph from which t...
【简答题】碘量法测定溶解氧时,先 ,再加入 ,水合氧化锰将I - 氧化成I 2 ,I 2 再用 。
【单选题】As Dr Samuel Johnson said in a different era about ladies preaching, the surprising thing about computers is not that they think less well than a man, but that they think at all. The early electronic ...
A.
quickness of decision making
B.
drives and sentiment
C.
development of reasoning power
D.
information storage
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