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【单选题】
低耐热高韧性热作模具钢5Cr2NiMoVSi主要添加了一定量的V和Si，从而使高温强度大幅提高，且具有更高的（）和热稳定性。A.
淬硬性
B.
淬透性
C.
韧性
D.
耐磨性
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【简答题】r____ a. 1 sb. who is refinedis polite and seems to be well-educated or to belong to a high social class 优雅的;有教养的 2 ( usu.beforenoun ) a substance that is refined has been made pure by an industrialpr...
【简答题】a. 1 sb. who is refined is polite and seems to be well-educated or to belong to a high social class 优雅的;有教养的2 (usu. before noun) a substance that is refined has been made pure by an industrial process...
【简答题】2 THE FAMILIES OF ENGINEERING MATERIALS It is conventional to classify the materials of engineering into the six broad families shown in Figure 3.1: metals, polymers, elastomers, ceramics, glasses, an...
【简答题】数字说明法中除了可以用基数来讲解之外，还可以用什么?
【简答题】ACTIVITY 1 It’s a Shame to Leave You Alone Maria: Please follow me to our 1. first, Mr. Lewis. This is a pure wool carpet and that one is of 2. wool, both made in our company. We use two ways in weavi...
【简答题】青蛙除了用肺呼吸外，还可以用哪个部位进行呼吸?
【简答题】a . be made pure by having other substances removed from it
【单选题】《空调列车服务质量规范》规定:普速旅客列车各车厢紧急制动阀有( ),印有“危险勿动”警示标志;紧急制动阀手柄施封良好,压力表指示正常。
A.
铅封;
B.
封印;
C.
铅印;
D.
包封;
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