单项选择题
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
单项选择题 A face line is used to（）.
单项选择题 A drift lead indicates that the vessel is dragging anchor when the line is（）.
单项选择题 A deepwell pump is a type of（）.
