对产品的设计、试制阶段进行的成本控制属（）。
絮凝剂的作用是使水中悬浮物质的（）凝聚，同时去除部分（）和（）。
Which two statements about the open and shared key wireless-authentication methods are true？ （） [" Shared key authentication is considered more secure than open authentication."," Shared key authentication is considered less secure than open authentication."," If the WEP keys do not match using the open authentication method， the client will not authenticate， associate， and transfer data."," If the WEP keys do not match using the open authentication method， the client will still be able to authenticate and associate， but will not transfer data."," If the WEP keys do not match using the open authentication method， the client will still be able to authenticate， associate， and transfer data."]
人体内食物消化后吸收的主要部位是（）。 ["口腔","胃","小肠","大肠"]
我国反对霸权主义和强权政治针对的是（）。 ["具体的霸权、强权行径","任何军事集团","某个国家集团","某个大国"]
说明下列句中词的古义和今义穆公访诸蹇叔。
