No modification of or additions to this Agreement shall be binding upon ABC unless such modification is in writing and signed by the ABC Division Service Vice President authorized to make such revisions and an authorized agent of Customer.

• 本合同的修改和增补除非成书面形式，并由abc有权认可这类修改的区域维修副总裁及客户授权人的签名，否则对abc是无效的。