我不是公主暴走的熊猫:what part of a watch do we use when we greet someone ?

what part of a watch do we use when we greet someone ? What letter is a part of head? What letter is a part of vegetable? what letter is a part of the face What letter is a part of the head? a part of 和great part of a large part of part of a fool What part of the electromagnetic spectrum does a microwave oven use? 猜一猜 What letter is a part of the head?请问答案是什么?