单项选择题
The Master or person in charge of a ship shall ensure the crane record book shows the（）.
A.Date and description of each failure B.Average load in pounds for each usage C.Total number of lifts for each usage D.All of the above
单项选择题 The item（）is not the advantage of the hydraulic winch．
单项选择题 Sudden starts or stops of the boom is likely to cause all of the following except（）.
单项选择题 Running an electric winch at slow speed over a long period of time causes（）.
