单选题On which type davit does the davit head stay at the same height?（）ARadialBSheath-screwCQuadrantalDGravity
单选题
On which type davit does the davit head stay at the same height?（）
A
Radial
B
Sheath-screw
C
Quadrantal
D
Gravity
参考解析
解析：
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