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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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吊杆的部件有：吊杆支架、鹅颈头、中心稳索、支索、千斤索和千斤索滑车组等。B
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考题
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考题
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decreases as the boom's angle to the horizontal decreases
考题
单选题A single heavy wire made up for the topping lift is called a（）.A
baleB
spanner wireC
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