牙体磨损的并发症().
A.牙本质过敏
B.食物嵌塞
C.牙髓病
D.颞颌关节功能紊乱
E.创伤性溃疡
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Mrs. Brown is from London in England, but she likes in China. She says her students all work very and they are very friendly. She loves very much. Mrs. Brown a son and a daughter. Her son’s name is Jack. He is ten. Her daughter’s name is Sue. She is seven old. They study in China. They don’t have classes weekends. They their school very much. After school, they often shopping or play sports. They help their mother some housework sometimes. They have a happy .
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粘贴造口袋时,尽量避开()、()或皱褶处。
孔雀开屏和仙鹤起舞,其主要目的是 [ ]
A.展示它的美丽
B.雄性吸引雌性,利于繁殖
C.吓走敌害
D.寻找食物
当某队在前场控制活球并且比赛计时钟正在运行时,该队的队员不得停留在对方队的限制区内超过持续的()秒钟,否则为违例。
()教育规范可分为行为规范、道德规范等
A.从作用对象上分
B.从涉及内容上分
C.从适用范围上分
D.从方法上分