后牙Ⅴ类洞，可摘局部义齿基牙修复，最常见的修复材料是（）
A. 银汞合金
B. 复合树脂
C. 玻璃离子粘固剂
D．磷酸锌粘固剂
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亚马逊卖家类型有（）
Amazon Vendor Central 简称VC
B. Amazon Vendor Express 简称VE
C. Amazon Seller Central 简称SC或AS
D. Amazon Business Seller 简称ABS
Which of the following is not a commonly used research method for uncertain systems（）
A. Probability statistics
B. Fuzzy mathematics
C. Grey system
D. Operations Research
Grey system theory is the scientific method to solve（）
A. Complex problems of certainty
B. Semi-deterministic complex problem
C. Uncertain complex problem
D. Uncertain semi-complex problems
The research object of gray system theory is（）
A. Clear extension, clear connotation
B. Unclear extension, clear connotation
Clear extension, unclear connotation
D. Unclear extension, unclear connotation
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