The visual field (VF) is the area within which objects can be seen by the eye as it fixes on a central point. The central field is an area extending 25° surrounding the fixation point. The peripheral field is the remainder of the area within which objects can be viewed. This test eva...
Case report: analytical electron microscopy of lung granulomas associated with exposure to coating materials carried by glass wool fibers Man-made vitreous fibers (MMVF) are inorganic amorphous fibers made from glass, rock, clay, slag, or pure oxide raw material. ...
VF By Any Other Name 来自 EBSCO 喜欢 0 阅读量: 660 作者: JL Leszak 摘要: Narrates the experiences with people who use stamp descriptions that are not consistent with the levels of grading found in stamp catalogs. Story of a lady who bragged about her archival collection of Elvis ...
BYV32-xxx, BYVF32-xxx, BYVB32-xxx Dual Common-Cathode Ultrafast Rectifier General Information Soldering Process Soldering Process Markings Diodes Group Body Marking Marking Packaging Information Packaging Information Packaging Information Packaging Information Package Information Package Drawings Product Litera...
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GROUP BY 是分组查询, 一般 GROUP BY 是和 聚合函数配合使用,你可以想想 你用了GROUP BY 按 ITEM.ITEMNUM 这个字段分组,那其他字段内容不同,变成一对多又改如何显示呢,比如下面所示 A B 1 abc 1 bcd 1 asdfg select A,B from table group by A 你说这样查出来是什么结果,A B abc 1 bcd ...
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