问题
单项选择题
Anchors are prevent from running out when secured by the（）.
A.brake
B.devil's claw
C.pawls
D.All of the above
答案
参考答案：D
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Anchors are prevent from running out when secured by the（）.
A.brake
B.devil's claw
C.pawls
D.All of the above
参考答案：D