单项选择题
A grapnel is a（）.
A.device for securing a chain topping lift B.hook to prevent the anchor cable from slipping C.device used to drag for a submerged cable or line D.type of clam bucket used for discharging bulk cargo
单项选择题 A deck beam does NOT（）.
单项选择题 （）are to be used for dunnage if you load rice.
单项选择题 When loading a cargo of taconite，proper sequencing of loading by hatch number is necessary to （）.
