单项选择题
A solution to overcome tripping defects is an arrangement of special plates on either side of the flukes, designed to set them in the correct tripping position. These special plates are called（）.
A.trippers B.stocks C.awl D.palms
单项选择题 A spark arrestor（）.
单项选择题 A stay is（）.
单项选择题 A survival craft being used to pick up a person who has fallen overboard from a vessel ahould approach the person（）.
