何谓牙本质过敏?
参考答案:
牙本质暴露区受到机械、温度或甜酸食物刺激后,引起牙齿敏一感症状。主要表现为激惹性痛,刺激除去后症状立即消失。不痛时,用探针在牙面可找到过敏点。
1949年1月,毛 * * 、周恩来向宋庆龄发出邀请电报:“中国革命胜利的形势已使反动派濒临死亡的末日……至祈先生命驾北来,参加此一人民历史伟大的事业。”“人民历史伟大的事业。”是指
A.筹建新中国
B.召开人民代表大会
C.召开中共七大
D.打倒日本帝国主义
Spyware and other forms of malware are the biggest online threat to your computer's () nowadays. These malicious () which get to your PC through freeware, shareware, commercial sites, deceptive pop-ups or in any other way, can record your surfing habits and sites you visit, share your personal information with their partners. Any personal (), when in wrong hands, can leave you a victim of an "identity theft" by steeling your credit ()details, birth records and other () information.
can leave you a victim of an "identity theft" by steeling your credit ()details.
A. reputation
B. password
C. address
D. card