This paper is a study on the invertibility of the commutator of scalar-idempotent elements and scalar-involutory elements of a unitary ring.

本文研究在一有位元的环中两倍幂等元的位子与两倍对合元的位子的可逆性问题。

We can machine the commutator and voltameter,we have to deliver them to the shop for rectifying.

我们可向器车光并拉槽。至于电流表与电压表，我们得送到车间去调整。