如果飞机离地面8000米记为+8000米,现在它又下降了1000米,那么现在飞机的高度可记为( )米。
+7000
My grandma used to live in the country, but now she _______living in the city and likes the city life.
A.is used to
B.is used for
C.used to
D.uses to
油脂类软膏基质使用( )。
A.过滤除菌B.热压灭菌C.煮沸灭菌D.气体灭菌E.干热灭菌