某公司生产甲产品50件,共耗用直接材料100千克,单位产品直接材料标准耗用量为2.2千克,每千克材料的标准价格为20元,实际价格为23元,则该产品直接材料价格差异为()。 ["100元","200元","300元","250元"]
沥青混合料的配合比设计包括()、()、()三个阶段。
Which two of these are characteristics of an IPS device?() [" passively listens to network traffic"," is an active device in the traffic path"," has a permissive interface that is used to monitor networks"," traffic arrives on one IPS interface and exits on another"]
路基横断面形式可分为()、()、()。
酶的大分子修饰
试述动作技能和智力技能的关系。