【单选题】— Do you think he will do me a favor? — As far as I know, he is the last one to help others. He _______ be prepared to give you a hand, though. [ ]
【多选题】强化理论认为: ( )
C.
正强化的方式应是间断的、时间和数量都不固定的;
【单选题】以下四种化合物,能同时产生B吸收带、K吸收带和R吸收带的是
【单选题】某社会工作服务机构通过公益筹款的形式,在贫困农村地区开展“每天一包奶”项目,计划给贫困地区儿童每天提供一包牛奶,目前已有2万多名儿童受益。从长期目标来看,该项目对当地儿童长效影响主要体现在( )。
【简答题】a multi-purpose machine tool
【单选题】_____ machine is a device for transmitting force to accomplish a definite purpose.