要取得型号合格证(见1. 2.5节)，以下步骤是必需的。

To attain the Type Certificate (see Section 1.2.5), the following steps are necessary.

youdao

要取得型号合格证(见1. 2.5节)，以下步骤是必需的。

To attain the Type Certificate (see Section 1.2.5), the following steps are necessary.

youdao