单项选择题

当时,无穷小量与的关系是( ).

A．

与

是等价无穷小量
B．

与

是同阶非等价无穷小量
C．

是比

高阶的无穷小量
D．

是比

低阶的无穷小量

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4. 有人认为这类投影仪的图像亮度更高、影像质量更佳。
A、They are considered by some to have lighter images, as well as superior video quality.
B、They are considered by some to have brighter images, as well as superior video quality.
C、They are considered by some to have lighter images, as well as interior video quality.
D、They are considered by some to have brighter images, as well as interior video quality.

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