單項(xiàng)選擇題Which part provides for transverse control and positioning of a boom in a conventional yard and stay system（）.
A.Guy
B.Shroud
C.Spider
D.Topping lift
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1.單項(xiàng)選擇題Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.
A.Cargo whip
B.Gooseneck fitting
C.Spider band
D.Topping lift
2.單項(xiàng)選擇題Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.
A.Loading
B.Discharging
C.Crude oil washing
D.Steaming tanks
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