单项选择题

解决方案必须坚持

A．数据导向
B．过程导向
C．经验导向
D．问题导向

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单项选择题

The function of the UN Commission on Sustainable Development is ____to ‘receive and analyze relevant input from competent non-governmental organizations, including the scientific and private sector, in the context of the overall implementation of Agenda 21’.
A、intended
B、mandated
C、planed
D、accomplished

单项选择题

金属材料在载荷作用下抵抗变形和破坏的能力是:

A．硬度
B．强度
C．塑性
D．弹性