单项选择题
A.Exemption space B.Tonnage deck C.Cofferdam D.Tonnage opening
A tackle by which the outer end of a boom is raised and...
单项选择题A tackle by which the outer end of a boom is raised and lowered is the topping（）.
A.Boom B.Lift C.Raise D.Tackle
A stopper is（）.A.A short length of line used for tempor...
单项选择题A stopper is（）.
A.A short length of line used for temporarily holding another line B.A snatch block for handling a topping lift C.An engine order telegraph D.The brake on a cargo winch
A stay is（）.A.Standing riggingB.A downhaulC.A halyardD....
单项选择题A stay is（）.
A.Standing rigging B.A downhaul C.A halyard D.A jib
