题目内容

材料开始塑性变形所需的应力称为_________。

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To decrease foveal fatigue in shade matching，what should you do()

A. 100k for less than 5 minutes
B. wet the tooth
C. place color samples next to tooth
D. match in northern light

延伸率是材料__的标志。表示材料_变形的能力。

对于铸造合金来说，为什么伸长率值不总是铸件边缘可磨光性的指征？

Immediately after cementing a full cast gold crown，the patient complains of a shooting pain every time the opposing teeth touch because of()

A. galvanic current
B. microleakage
C. hyper-occlusion ofthe crown
D. excess acid in cement