题目内容

3. 以下哪项不是小满的习俗？

A. Eating bitter herbs
B. Tea picking
C. Offering sacrifices to the silkworms
D. Offering sacrifices to the Waterwheel God

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4. ____ are the symbols of wealth and prosperity.

Abundant rainwater
B. The Silkwormand Cart Gods
Culture activities
D. Eating bitter herbs

5. Lesser Fullness is when China celebrates the birthday of the ___, Leizu.

A. silkworm goddess
B. cart gods
C. emperor
D. empress

轴的支承结构形式有哪几种？各用于什么场合？1、；2、；3、。

滚动轴承的配合有何特点？如何选择配合？1、；2、。