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We are working hard on ____(we) project.

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My flat is on the third floor。 ____ (they) is on ther tenth floor.

The umbrella is _(she )。 _(it) colour is purple.

最常用的数字式仪表显示器有和。

仪表刻度盘上刻印的、字母、和一些专用符号，统称为字符。