问题
单项选择题
On which type davit does the davit head stay at the same height?（）
A.Radial
B.Sheath-screw
C.Quadrantal
D.Gravity
答案
参考答案：A
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On which type davit does the davit head stay at the same height?（）
A.Radial
B.Sheath-screw
C.Quadrantal
D.Gravity
参考答案：A