单选题A flounder plate，on a topping lift，is（）.Aa fairlead blockBa swivel pin for the topping lift blockCa triangular steel plate with a hole at each cornerDthe lower block of a multiple part topping lift
单选题
A flounder plate，on a topping lift，is（）.
A
a fairlead block
B
a swivel pin for the topping lift block
C
a triangular steel plate with a hole at each corner
D
the lower block of a multiple part topping lift
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