气管内导管套囊应充多少容量气体（）
A.3～4ml
B.5～6ml
C.7～8ml
D.9～12ml
E.充气至吸气和呼气时刚好不漏气为准
参考答案：E
8255可以扩展（）个并行口，其中（）条口线具有位操作功能.
Don't worry. All the patients _______ by the nurses. [ ]
A. take good care of
B. are taken good care of
C. are well taken of
D. are take good care of
