单选题A spanner is a（）.Across connection line between two main fire linesBspecial wrench for tightening couplings in a fire hose lineCtackle rigged to support a fire hoseDNone of the above
单选题
A spanner is a（）.
A
cross connection line between two main fire lines
B
special wrench for tightening couplings in a fire hose line
C
tackle rigged to support a fire hose
D
None of the above
参考解析
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