单项选择题
A band or collar on the top end of a boom which the topping lift, midships guy, and outboard guys are secured, is called the（）.
A.collar band B.guy band C.pad eye collar D.spider band
单项选择题 A bench hook is used for（）.
单项选择题 A block that can be opened at the hook or shackle end to receive a bight of the line is a（）.
单项选择题 A buoy having red and green horizontal bands would have a light characteristic of（）.
