膈下游离气体提示________。
参考答案:腹腔内空腔脏器穿孔
---It’s very important _____ us to make plans before a new term.
---Yes. You must try to make it carefully.
A.of
B.for
C.to
D.in
为提高疗效,行神经射频热凝时毁损电极最好与神经()。
A.成60度角
B.平行
C.成30度角
D.垂直
E.成45度角