高位复杂肛瘘的治疗可先将皮下管切开变为单纯瘘，再挂线治疗高位瘘。（）
参考答案：对
__________ speed and comfort, bicycles can’t match other means of transportation like cars and trains.
A．In terms of
B．In case of
C．In stead of
D．In spite of
氧气管道在安装时应注意什么问题？
