垂直截渗墙、帷幕灌浆、板桩等均属于垂直截渗（ ）。

多项选择题What are the methods to help you make a strong prepared speech? ( )A. Understand the audience and occasion.B. Decide on a central point or purpose.C. Use various supporting materials.D. Use clear organization.

未分类题SQL是关系数据库领域的主流语言，以下关SQL的描述中，错误的是D.SQL语言既是自含式语言，又是嵌入式语言

单项选择题一对等位基因的杂合体Aa连续自交4次后，后代中杂合体和纯合体分别占（ ）。 A. 1 2，1 2 B. 1 2，1 4 C. 1 4，3 4 D. 1 16，15 16

单项选择题肾衰竭尿毒症时可出现全身多个系统的功能紊乱。（ ）

未分类题By mentioning 'double dipping'(Paragraph 4), the author is talking aboutA.awards given to patients by doctors.B.market share secured by insurers.C.malpractice reform. bill to be passeD.D.insurance rates-cut in some states.