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问题 单项选择题

对于临时工、青年工人、刚参加工作的毕业生，由于对安全生产中各项工作的规章制度了解不够全面，缺乏经验，安全意识差，容易产生（）性的违章。

A、无意识

B、麻痹侥幸

C、经验主义

D、随众

答案

参考答案：A

单项选择题

关于肾母细胞瘤的特点不正确是（）.

A.腹部巨大包块是本病的主要特点

B.多于3岁以前发病

C.也偶发于成年人

D.常见发热和高血压

E.常见明显血尿
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单项选择题

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 fine 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.

The difference between a pearl and a cultured pearl is the nature of the________.

A．color

B．introduction of the irritating impurity

C．coating material

D．irritating impurity
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