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问题 不定项选择

我国的计量监督管理实行按( )的体制。

A．行政区划统一领导、分级负责

B．经济合理、就地就近

C．固定检定关系、定点送检

D．实行定点、定期的检定

答案

参考答案：A

单项选择题 B1型题

当动物缺乏此维生素时表现生长发育缓慢，衰弱乏力，关节肿胀，屈曲不全，骨短粗，共济失调，皮肤黏膜苍白，消化不良等，此维生素为（）

A.维生素B1

B.维生素B2

C.维生素B6

D.维生素D

E.胆碱
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单项选择题

Which of the following statements about object oriented databse is not correct

A． Each object has a unique object identity in the system.

B． Encapsulation and inheritance are two important features of object oriented database.

C． A subclass can inherit the attributes and methods of all its superclasses.

D． A subclass includes the attributes and methods of all its subclasses.
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