Translation of "Unit" in Chinese

This is an old unit.

这是个旧部件。

Why would you appear in my unit?

你为什么会出现在我工作单位？

The family is the fundamental unit of society.

家庭是社會的核心。

At that moment, the telephone in the unit office rang.

这个时刻，分队办公室里电话响了。

A vector is a unit vector if its norm is 1.

模为1的向量是单位向量。

At around 12pm, we go to the dining area of our unit for lunch.

中午十二点左右，到我们单位的饭厅去吃午饭。