单选题The boom stops are installed on an offshore crane to（）.Aprevent the boom from being raised too highBprevent the boom from swingingCsupport the boom when not in useDprevent the boom from being lowered
单选题
The boom stops are installed on an offshore crane to（）.
A
prevent the boom from being raised too high
B
prevent the boom from swinging
C
support the boom when not in use
D
prevent the boom from being lowered
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