原式=|x-2|+|x-4|，
∵2＜x＜3，
∴原式=x-2-（x-4）
=x-2-x+4
=2．
故答案为2．
–Do you know what he _______ the day before yesterday?
-Yes. He ________.
A．does; plays soccer
B．did; goes to a movie
C．did; went to the beach
D．do; went shopping
论述点蚀的机理，并阐述点蚀与缝隙腐蚀的区别。
