A、A.year
B、B.two years
C、C.four years
D、D.five years
更多“Cargo booms must be weight tested to recertify the Safe Working Load (SWL) every（）.”相关的问题
A、Wet cargo must be kept away from dry cargo. B、Heavy cargo must be kept away from dry cargo. C、Light cargo must be kept away from dry cargo. D、Wet cargo must be kept away from light cargo.
A、These lashing tools must be tightened again. B、These lashing wires must be tightened again. C、These lashing bars must be secured again. D、These cargo wires must be loosened again.
A、The tank must be gas freed B、The tank must be ballasted C、The tank must be vented to the atmosphere D、The bypass valve must also be closed
A、increases as the cargo closes the head while hoisting B、increases if the cargo runner is doubled up C、decreases as the boom is topped to a greater angle D、is determined by the thrust stresses on the boom
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