请教一个关于OR值计算的问题。各位大侠,我在复习时遇到一道计算题,如下: 在500名病例与500名对照的配对病例对照研究中,有400名病例和100名对照有暴露史,OR值应为( ) A.18 B.16 C.20 D.1
针对你的问题“hbuilder is automatically signed, but provisioning profile a7e03077-46db-4b91-b0c4-20fd613c1e14 has been manually specified. set the provisioning profile value to 'automatic' in the build settings editor, or switch to manual signing in the signing & capabilities editor.”,我们可...
A device for the local cooling or heating of an object by means of a fluid is disclosed. The device comprises a circulation pump for the fluid. A thermal contact element for making thermal contact with the object is integrated in the cir... ...