as mentioned above和as is mentioned above有什么区别
2个回答

as mentioned above,如上所述,一般做插入语

As mentioned above,an object has positive charge when it has lost electrons.

如上所述,物体失去电子时带正电荷.

as is mentioned above,如上所述,也做插入语

As is mentioned above,substances are constantly undergoing physical and chemical changes .

如上所述,物质总是在进行着物理变化和化学变化.

因此,它们之间没有区别