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【单选题】
体液调节与神经调节相比较,体液调节的特点不包括A.
反应速度较慢
B.
作用时间短暂
C.
不够精确
D.
作用范围较广泛
E.
主要调节新陈代谢及生长发育等
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【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( )
A.
stabilize its shade
B.
improve its physical properties
C.
provide it with a pleasant odor
D.
make it more reflective
【单选题】The primary reason for the popularity of LIFO is that it:
A.
Provides better matching of physical flow and cost flow.
B.
Saves income taxes currently.
C.
Simplifies recordkeeping.
D.
Provides a permanent reduction of income taxes.
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