Cargo booms must be weight tested to recertify the Safe Working Load（SWL）every ______．A.YearB.Two yearsC.Four yearsD.Five years
Cargo booms must be weight tested to recertify the Safe Working Load（SWL）every ______．
A.Year
B.Two years
C.Four years
D.Five years
相关考题：
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单选题Cargo booms must be weight tested to recertify the Safe Working Load (SWL) every（）.AyearBtwo yearsCfour yearsDfive years