（）是组对的第二要素。

[单选题]第二组的组距是（ ）。A．75B．60C．50D．45

[单选题]广告传播的第二要素是（）。A . 对谁说B . 怎么说C . 媒介D . 说什么

[名词解释] 第二工作组

[单选题]第二组数据主要表明( )。A．项目申请已经成为科研人员最为关注、最为头痛的事情了B．课题申请难度大，竞争激烈C．以人际关系为主导因素的“小圈子”，背离了公平竞争原则D．经费投人力度不能满足科研的需要

[单选题]第二组The only attention that heat exchanger should require is to ensure that the heat transfer surfaces remain substantially clean and the flow passages generally clear of obstruction. Indication that undue fouling is occurring is given by a progressiv

[判断题] 知识资源成为科技创新的第二要素.A . 正确B . 错误

[单选题]（）是组对的第三要素。A . 支撑B . 定位C . 夹紧D . 不确定

[填空题] 服装设计的第一要素是（），第二要素是样式和时尚。

[单选题]第二组D．isplacement pumps are those where the volume of the pump chamber is alternately increased to draw the liquid in from the suction pipe and then decreased to force the liquid out into the delivery pipe. Centrifugal pumps are those wherein an impel

[单选题]第二组Under normal operation, some lubrication oil mist may be discharged from the air compressor to the air start system. This oil may be from excess compressor cylinder lubrication, from faulty oil scraper rings, or may even be suspended oil vapor con