单项选择题
When rigging a stage，the standing part should be fastened to the horns of a stage with which of the following hitches（）.
A.Clove hitch B.Timber hitch C.Marlinespike hitch D.Double blackwall hitch
单项选择题 When rigging a bosun’s chair，a tail block or lizard is used to（）.
单项选择题 When paying out nylon line from around the bitts（）.
单项选择题 When attempting to free an anchor jammed in the hawsepipe，the simplest method of freeing it may be（）.
