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【单选题】
下面对精加工基准的选择中不正确的是( )。A.
基准重合的原则,就是尽可能的选用设计基准作为定位基准
B.
基准同一原则,位置精度要求高的某些表面加工时,尽可能选用同一定位基准
C.
选择精度较高,安装稳定可靠的表面作为精基准
D.
在实际生产中,我们选择精基准必须完全符合上面三个基准
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皮皮学刷刷变学霸
举一反三
【单选题】Economics models __________________.
A.
are used as detailed representations that include all aspects of an environmental issue
B.
can be useful for creating solutions to environmental problems if the assumptions are accurate
C.
are likely to produce the same conclusions about environmental issues despite changes in the model's assumptions
D.
can be used to create accurate and concise representations of environmental problems