Which hand does the commercial vehicle salesman use when shaking hands with customers?

When shaking hands, the outstretched palm should be perpendicular to the ground, and it is not appropriate for the palm to go down or up. When shaking hands, the palms should be clenched, which is in line with the principle of sincerity and friendship. It is an internationally accepted principle that you must use your right hand when shaking hands. Even people who are used to using their left hand must shake hands with their right hand.