从一阳床取出一些变黑的树脂,放在试管中,加几毫升水,摆动1min发现水面有“虹”出现,说明树脂被()。
A.铁污染;
B.硫酸钙污染;
C.油污染;
D.有机物污染。
参考答案:C
---Honey,I’d like to go to South Africa for the World Cup this weekend.
---_____You must help me with the decoration of the house.
A.Forget it!
B.That’s great!
C.Why?
D.Go ahead
患者,男性,26岁,左下第一磨牙咬合面深龋伴可复性牙髓炎。治疗用的材料是
A.银汞合金
B.复合树脂
C.羧酸锌粘固粉
D.破璃离子粘固粉
E.氧化锌丁香油粘固剂