问题
单项选择题
患者，男，38岁，左髋部疼痛，并逐渐加重，体检:左髋部明显肿胀压痛，无明显发热，结合所提供的图片，最可能的诊断是()
A．骨巨细胞瘤
B．纤维肉瘤
C．骨肉瘤
D．软骨肉瘤
E．软骨黏液纤维瘤
答案
参考答案：D
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患者，男，38岁，左髋部疼痛，并逐渐加重，体检:左髋部明显肿胀压痛，无明显发热，结合所提供的图片，最可能的诊断是()
A．骨巨细胞瘤
B．纤维肉瘤
C．骨肉瘤
D．软骨肉瘤
E．软骨黏液纤维瘤
参考答案：D
| The most popular organic gem is the pearl. A pearl is the response of a marine mollusk to the presence of an irritating impurity accidentally introduced into its body; a cultured pearl is the result of the intentional insertion of a mother-of-pearl bead into a live mollusk. Whether introduced accidentally or intentionally, the pearl-making process is the same: the mollusk coats the irritant with a substance called nacre. Nacre is composed chiefly of calcium carbonate. Because very few natural pearls are now on the market, most pearls used in free jewelry are cultured. These include "Biwa" pearls and most other freshwater pearls. Cultured pearls are not easily distinguished from natural pearls except by an expert. |
Nacre is a substance that is ______.
A．mechanically manufactured
B．the result of laboratory testing
C．organically secreted by the mollusk
D．present in the chemical composition of freshwater pounds