外周中长导管比中心静脉导管发生感染的危险性低。
参考答案：对
欲输送250m3/h的蒸汽，蒸汽的流速取25m/s，则应选择输送管的管径为（）。
A、φ804mm
B、φ1084mm
C、φ503mm
D、φ1504mm
_______you've got a precious chance, you might as well make full use of it. [ ]
A. In case
B. Now that
C. Even though
D. The moment
