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achievement _____________。

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In the long term biotechnology offers a means of solving some major world problems, in particular those related to medicine, food production, pollution control and the development of new energy sources.

Biotechnology has been defined as a subject that uses biological organism, systems or processes to manufacture industrial products.

可以作为块的属性的字段的类别不包括以下哪些选项?

A. 日期时间
B. 文档
C. 对象
D. 时间

在定义块属性时,要使属性为定值,可选择哪个模式:

A. 不可见
B. 固定
C. 验证
D. 预置