单项选择题
What does “evel-luffing” accomplish during crane operations（）.
A.It prevents the load from swinging when the boom level is adjusted B.Less power is needed when topping the boom with a load on the hook C.It maintains the height of the load above the deck D.All of the above
单项选择题 They（）loading at 1400 hours．
单项选择题 The net productivity per gang-hour can be improved through a decrease of（）.
单项选择题 The Master or person in charge of a ship shall ensure the crane record book shows the（）.
