安全用药事关人体健康，下列有关安全用药的叙述，正确的是（    ）

深冷分离法又称低温蒸馏法．该法能将空气中的氧气和氮气分离出来，深冷分离法原理：以空气为原料，经压缩等处理使空气成为液态空气（液空）．再进入干燥净化器，除去其他成分，最后分离出氮气和氧气．

（1）物质的变化有物理变化和化学变化．深冷分离法属于____ 变化．

（2）空气经压缩等处理成液空的过程中发生的物态变化是____ ．

    A year has twelve months. My favorite month is October. October 1^st is National Day(国庆节）. We have a seven-day holiday(假期). During the holiday, my parents always take me to see my grandparents.

    Our school has some interesting things in October. On the 12th , we have a soccer game. I don't love basket ball. It's difficult for me. But I love soccer. I love playing soccer and watching soccer games. We have a book sale on October 20th. I have three old books and I want to sell them. The art festival is fun. We have it on October 29th. My birthday is also on this day. October is a really great month for me.

①“抗美援朝，保家卫国” ②“上山下乡”，“停课闹革命”

③“港澳回归，洗雪国耻” ④“人有多大胆，地有多大产”