题目内容

All powders are wrapped in plastic bags and packed in tins, thelids______are sealed with adhesive tape.

A. which
B. by which
C. at which
D. of which

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在中国人的生活里，酒也是一种神奇的精灵。据现有的考古发现，6000多年前中国人就开始酿酒了。为了酿出最好的酒，中国人一直在探索酿造方法。Jiu of Chinese people. Chinese started to jiu 6000 years ago, according to archaeological findings. People have worked hard to _ making jiu for thousands of years.

中国人以饮白酒，黄酒为主。白酒是中国传统，特有的蒸馏酒。几千年来，饮酒器具也在不断变化。Chinese drink white spirits and rice wine. White spirits are from sorghum or maize. The _ used for drinking has changed a lot over the course of history.

从樽到盅，演化着中国的酒文化。粮食幻化的精灵，酒陪伴中国人历经出生，结婚，生子等一生重要场合，陪伴他们走过六千年。The jiu culture the containers changing from wine goblets to handless cups. As a magical beverage and custom, it has , such as weddings and birthdays for more than 6000 years.

若偏心压力位于截面核心的内部,则中性轴穿越杆件的横截面。

A. 对
B. 错