单项选择题

小篆，是哪个朝代的官方字体？

A．汉朝
B．商朝
C．唐朝
D．秦朝

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单项选择题

Choose the correct sentence(s) from the set of sentences below.
A five-year-old child knows over six thousand words he or she has also learned more than one thousand rules of grammar.
A、A five-year-old child knows over six thousand words, he or she has also learned more than one thousand rules of grammar.
B、A five-year-old child knows over six thousand words. He or she, has also learned more than one thousand rules of grammar.
C、A five-year-old child knows over six thousand words. He, or she has also learned more than one thousand rules of grammar.
D、A five-year-old child knows over six thousand words, and he or she has also learned more than one thousand rules of grammar.

单项选择题

凸轮轮廓线上某点的压力角，是该点的法线方向与该点速度方向之间的夹角。
A、正确
B、错误