为了安抚后周留下的大批官员,北宋在保留了唐代以来三省、六部及各寺、监的官称的同时,实行官职名称与实际职务相脱离的政策,另派官员担任实际职务,称为“差遣”。“差遣”的实质是
下列地区中哪些位于我国地势的第三级阶梯上
——These plans are all suitable. I haven't decided which one to choose.
——It's OK. You ________ plenty of time to make a decision.