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【多选题】
In material science or engineering materials, the following factors ( ) form the basis of the various systems of classifications.A.
The mode of occurrence of the material in the nature
B.
The chemical composition of the material
C.
The atomic and crystalline structure of material
D.
The industrial use of material
E.
The refining and the manufacturing process to which the material is subjected before it gets the required properties.
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A.
正确
B.
错误
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【单选题】患者男性,60岁,既往有冠心病史5年,2小时前因情绪激动而突然出现胸骨后压榨样疼痛,伴有烦躁不安,出冷汗,病人极度紧张,有濒死感,诊断为急性心肌梗塞收住监护室。发病诱因不可能是下列哪种情况
A.
劳累
B.
卧床时
C.
情绪激动
D.
饱餐
E.
大便用力后
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