皮皮学，免费搜题
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【单选题】
患者，男，1岁2个月，仍未见第一颗乳牙萌出，已排除“无牙畸形”。 该发育异常不可能的病因是A.
佝偻病
B.
甲状腺功能低下
C.
营养缺乏
D.
全身性骨硬化症
E.
肯定与全身因素有关
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】If we find materials available only in faraway places, it can be inferred that
A.
these materials were very popular at that time and sold in many places
B.
these materials were very easy to produce and were made locally
C.
people in this place were hunting tribes and traveled to distant places
D.
these materials were probably got by the means of traveling or trading
【简答题】给定的企业员工管理数据库 db_yggl 中包括部门表 tb_dept 和职工表 tb_emp 。 tb_dept(deptno,deptname,manager,office,telephone), 各字段合义依次为 : 部门号、部门名称、部门负责人姓名、办公地点、电话。 tb_emp(eno,name,,birth,education,worktime,title,salary,tele...
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