【简答题】______ is the primary reason for the high costs of medical expenses of the aged people.
【单选题】The primary reason for placing covers over storage batteries is to ______.
A.
Prevent the accumulation of explosive gases
B.
Protect the hull from leaking electrolyte
C.
Prevent movement of the battery in rough waters
D.
Protect against accidental shorting across terminals
【简答题】闭合电路的一部分导体在磁场中做切割磁感线运动时,导体中会产生电流,这种现象称 为 ,产生的电流叫做 。 2.电磁感应现象中,消耗 ,得到 。 3.发电机是根据 现象制成的,它是把 能转化为 能的装置。
【单选题】The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is _____.
A.
evaporation is accomplished in a vacuum
B.
due to the higher temperature of the incoming feed
C.
due to the latent heat of evaporation principle
D.
evaporation in a submerged medium produces more distillate
【单选题】The primary reason for using a coupling agent(silane)in a resin composite is to( )
B.
improve its physical properties
C.
provide it with a pleasant odor
D.
make it more reflective
【单选题】2在第11号染色体的短臂上有一个名叫D4DR的基因,它是一个名叫多巴胺受体的配方。多巴胺受体的任务是在某些神经细胞与其他神经细胞相连的地方伸到细胞膜外,准备着接纳一个小小的化学物质:多巴胺。多巴胺是一种神经递质,在得到一个电子信号之后被从其他神经细胞的顶端释放出来。当多巴胺受体与多巴胺接触的时候,多巴胺受体就会使它所在的神经细胞发出一个电子信号。这就是大脑工作的方法:电子信号导致化学信号,再导致电...
A.
多巴胺要多巴胺受体所在的神经细胞发出电子信号之后才能被释放出来
B.
大脑的工作方法就是电子信号的不断转换,多巴胺的接纳是其典型模式
C.
多巴胺受体存在于D4DR基因中,它的任务是接纳一种神经递质多巴胺
D.
多巴胺是大脑里主管“动机”的机构,可以调整自身流量决定个体性格