实施PICC置管静脉穿刺,穿刺进针角度约为()
A、5°
B、15~30°
C、30~45°
D、45~60°
参考答案:B
()difficulties we may come across, we'll help each other to overcome them.
A.Wherever
B.Whatever
C.However
D.Whenever
塑料螺纹的机械强度比金属螺纹机械强度低()倍。
A、2~4
B、5~10
C、10~20