备忘录是一个单位内部的通讯。

A a memorandum is a communication within an organization.

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确保业务单位内部控制程序有效执行，以符合法规规定及公司风险管理政策。

To ensure effective implementation of internal controls within business units, so as to comply with laws, regulations and risk management policies.

youdao

当然可以。信函必须从公司里送出去，要通过邮局邮寄，便函是一个单位内部的沟通形式。

Certainly. A letter must be sent out of the company and must be mailed or posted. A memorandum is a communication within an organization.

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