增面滚更换方法？
参考答案：
拆下地脚螺丝，用斤不落吊下，把新滚就位找正、找水平，把紧螺丝。
— According to my grandma, it is a good idea to eat chicken soup when you have a cold.
— _____, scientists agree with her.[ ]
A. Sooner or later
B. Once in a while
C. To be exact
D. Believe it or not
A．乒乓球的直径
B．书桌的高度
C．成人大拇指的宽度
D．初中物理教科书的宽度
