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 the problem that easy?渐开线形调制盘Is bound to its corresponding绑定到其对应的Is loaded with star cameos.刻有浮雕的宝石或贝壳。Isn't that extraordinary?渐开线旋流分离器Is that really necessary?恒定类Is this your blue jaquet?招标Is the baby still asleep?延伸渐开线Is saline bath face fine?不变子集Is that George's version?阴道内翻Is your father a glazier?渐开线啮合