ISBL信息系统基础语言isv.是（be的第三人称单数一般现在时）Is anyone downstairs yet?无效国家代码或代码页Is a fact hitherto unknown.这是一个至今无人知道的事实。Is that your final offer?具小总苞的Is your name David Brown?倒位Isn't that scenery great?存货卡Is Honesty out of Season?渐开线Is that the quickest way?adj.纠缠的Is this all your luggage?渐开型Is the pudding home made?包顶组织Is your eye-sight good?渐开线