滴毒性强的眼药后压迫内囊部2～3分钟是防止药物吸收后引起中毒反应。
参考答案：对
水泥混凝土流动性大说明其和易性好。( )
— What are you doing for vacation?
— We're ______. [ ]
A. go boating
B. visiting southern cities
C. going hike
