增强修复体固位力的方法不包括()
A.适当的预备体聚合度
B.选用合适的黏结材料
C.增加黏固剂膜的厚度
D.良好的黏结条件与技术
E.设计合理的辅助固位形
参考答案:C
Being a teacher always encouraging students to think for themselves, I won't tell them answers until they __________ on a math problem for more than an hour.
A.have worked
B.will have worked
C.will have been working
D.had worked
下列情况使得厂商的长期均衡时的利润为0()。
A.产品市场是完全竞争的
B.产品市场是垄断竞争的
C.古诺模型中的厂商
D.厂商是要素市场的完全竞争的买者和产品市场的完全竞争卖者
E.厂商是要素市场的独家买者和产品市场的完全竞争卖者