试题与答案

婴儿期儿童(出生后第一年)营养紊乱或疾病可导致() A.乳牙釉质发育不全 B.恒

题型:单项选择题 A1/A2型题

题目:

婴儿期儿童(出生后第一年)营养紊乱或疾病可导致()

A.乳牙釉质发育不全

B.恒牙釉质发育不全

C.乳牙过早萌出

D.双生牙畸形

E.乳牙萌出过迟

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析: DELETE命令是对记录进行逻辑删除,RECALL命令用于恢复逻辑删除的记录,PACK命令用于物理删除所有带有删除标记的记录,ZAP命令用于清空表。

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