单项选择题

动量矩与角动量完全是一个概念。

A．对
B．错

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单项选择题

3、臭氧层破坏导致紫外线对地球表面辐射量的增加，从而使全球皮肤癌的发病人数明显增加，造成这一现象的主要原因是（）。
A、人们大量使用氟氯烷烃
B、人们在炼钢时向空气中排放了大量的高炉煤气
C、石油炼制厂排放了大量的甲烷、氢气
D、硝酸、硫酸工厂排放了大量的二氧化硫和一氧化氮

Kangxi's enameled porcelains were usually executed in floral decorations. With the Western painters joining the making, the finished product was more or less influenced by Rococo style motifs and designs which were popular in Europe at the time.

答案：错误