问题
单项选择题
The hinge fitting used to attach the boom to the mast is the（）.
A.gooseneck
B.step
C.swivel
D.pintle
答案
参考答案：A
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The hinge fitting used to attach the boom to the mast is the（）.
A.gooseneck
B.step
C.swivel
D.pintle
参考答案：A