鉴别信息D(p || q)关于概率分布对(p, q)是 A: 下凸的（convex） B: 上凸的（concave）

The gel formed by methyl cellulose and gelatin can form a gel at a high temperature or a low temperature and is in the form of a solution at a medium temperature, which is called. A: concave gel B: convex gel C: hot gel D: cold gel

Which of the following descriptions is not correct?( ) A: lobulation is an important imaging sign to diagnose peripheral pulmonary carcinoma. B: cavity with irregular inner wall is a characteristic of peripheral pulmonary carcinoma. C: satellite lesion is used to describe peripheral pulmonary carcinoma. D: concave border with higher lateral part is a characteristic of pleural effusion.

中国大学MOOC: Both ‘clear’ [l] and ‘dark’ [ɫ] are formed with the tip of the tongue touching the teeth ridge. The only difference is that in the articulation of the ‘clear’ [l], the back part of the tongue is raised towards the hard palate. In the articulation of the ‘dark’ [ɫ], the front part of the tongue is raised towards the soft palate and slightly velarised, with a concave upper surface.

Which of the following is the incorrect description of malignant ulcers? A: In posteroanterior view, the niche is round or unrepresentative round, surrounded by convex curves B: Relatively large cancerous ulcer with shallow depth C: In posteroanterior view, the contour of the niche is outwards, surrounded by concave curves D: Large areas of mucosal folds around the ulcer are destroyed and disappeared E: Mucosal folds are concentrated towards the niches, and they are interrupted halfway before they arrive