It is not necessarily true that either x = = y or x! = y. x==y或x!=y都有可能是不正确的。
That is not necessarily the case, however, X-efficiency, the low efficiency arising from non-resource allocation, does exist, which lies, to a great extent, in the complicated social make-up of the enterprise. 而事实往往并非如此,存在着X(低)效率,即有着属于非资源配置方面的低效率。
Topical dorzolamide may have some effect in reducing central macular thickness in patients with XLRS, but this does not necessarily correlate with improvement in VA. 多佐胺在黄斑中心变薄的X连锁视网膜剥离患者可能有一定的治疗效果,但这与视觉灵敏度的改善没有必要的关联性。
The classification problem is then to find a good predictor for the class y of any sample of the same distribution ( not necessarily from the training set ) given only an observation [ 6 ] : 338. 所谓的分类问题就是指对于相同分布的样本x(可以是训练集以外的样本),都能预知其所属的类。
Firstly, an estimation algorithm for spectrum of the CT system is presented in the paper by using a standard cylinder or wedge phantom, where the mass attenuation coefficient of the contained material of the phantom is not necessarily to be known. 本文首先给出了由标准均匀圆柱状模体或楔状模体估计CT系统的X射线能谱的算法,该算法不必已知构成模体的物质关于不同能量的光子的质量衰减系数。