问题
单项选择题
Limit switches are used on which davits?（）
A.Sheath-screw davits
B.Gravity davits
C.Radial davits
D.Quadrantal davits
答案
参考答案：B
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Limit switches are used on which davits?（）
A.Sheath-screw davits
B.Gravity davits
C.Radial davits
D.Quadrantal davits
参考答案：B