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问题 单项选择题

劳动力商品最重要的特征是

A．劳动力商品的使用价值是价值和剩余价值的源泉
B．随着劳动力商品使用价值的消失，价值也消失
C．劳动力商品价值决定包含着一个历史和道德因素
D．劳动力成为商品是货币转化为资本的前提

答案

参考答案：A

单项选择题

脾梗死声像图是：①病变常位于近脾门处，呈楔形或不规则形，基底较宽，有时直达脾包膜，常呈低回声；②病变内无血供；③病变内可出现钙化的强回声，或坏死出现无回声区；④伴有腹水（）

A.①②③

B.①③

C.②④

D.④

E.①②③④
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单项选择题

Object-oriented DBMS integrated a variety of (81) data types-such as business procedures, graphics, pictures, voice and annotated text.

Object orientation also makes a (82) to application development efficiency. It makes the data, functions, attributes, and relationships an integral part of the (83) . In this way, objects can be reused and replicated.

Some leading RDBMS vendors support the concept of integrating object management capabilities with their current line of relational products. That capability enable users to the development cycle, since integrity logic and business roles no longer need to be programmed (84) each application.

（84）是（）

A.tool

B.in

C.idea

D.contribution

E.joke

F.short

G.object

H.theoretical

I.extent

J.shorten

K.real-world

L.into
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