单选题：磷酸锌粘固粉用于垫底有局限性的原因是（　　）。

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题目内容：
磷酸锌粘固粉用于垫底有局限性的原因是（　　）。 A．绝缘性能很优良
B．抗压强度98MPA
C．有一定的粘结性
D．对牙髓有刺激性
E．唾液中可被溶解
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答案解析：

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