问题
单项选择题
A metal ring on the bottom of a block，to which the standing part of a tackle is spliced，is known as a(n)（）.
A.becket
B.loop
C.swivel
D.eye
答案
参考答案：A
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A metal ring on the bottom of a block，to which the standing part of a tackle is spliced，is known as a(n)（）.
A.becket
B.loop
C.swivel
D.eye
参考答案：A