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【判断题】
强度是金属材料抵抗永久变形和断裂的能力。( )A.
正确
B.
错误
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
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【单选题】现场救护局部伤口处理正确的是 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
无菌纱布覆盖
B.
B ．内脏、组织等纳回伤口
C.
C ．清除伤口异物
D.
D ．清除血凝块 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
E.
外露的骨折端归位 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【单选题】Which of the following statements about the marginal rate of substitution is NOT correct?
A.
It measures the number of units of the good on the horizontal axis that a consumer must be compensated with to give up a unit of the good on the vertical axis, while remaining on the same indifference curve.
B.
It is measured by the slope of the indifference curve.
C.
It decreases in value when moving downward along a typical-shaped indifference curve.
D.
It is constant for goods that are perfect substitutes.
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