根据IMO的港口国监督程序的规定,对船舶的操作性检查包括: I.检查是否按规定显示应急部署表II.检查是否有船舶油污应急计划III.检查是否有防火控制图IV.检查是否有破损控制图（

l not attack ________ we are attacked; if attacked, we will certainly counter-attack. [A] if [B] when [C] unless [D] even if