在证券交易活动中,涉及公司的经营、财务或者对该公司证券的市场价格有重大影响的尚未公开的信息,为内幕信息。()
参考答案:对
When Tommy’s mother hides his favorite toy under a blanket, he acts as though it no longer exists and makes no attempt to retrieve it. Tommy is clearly in Piaget’s stage:()
A.Sensorimotor
B.Preoperational
C.Formal operational
D.Concrete operational
()不是密封填料环的作用。
A.冷却轴
B.保护轴
C.润滑轴
D.进行水封