髌骨骨折外固定采用的固定垫是空心垫。
参考答案：错
Document outputs are produced on (75) , devices that produce text or images on paper.
A．mouse and keyboard
B．scanners and plotters
C．display and scanners
D．printers and plotters
滴眼剂的pH值要求范围为（）
A.4-6
B.5-9
C.8-12
D.6-11.5
