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【单选题】
关于电源的电动势,下面说法正确的是 ( ) 。A.
电动势是表征电源把其他形式的能转化为电势能本领的物理量
B.
电动势在数值上等于外电路中通过 1 C 电荷量时电源提供的能量
C.
电源的电动势跟电源的体积有关，跟外电路有关
D.
电源的电动势越大，电力做功越多
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【单选题】Eric helped to explain some things about community medicine to Barack, and of course his ideas were affected by Barack _____ health care.
A.
thought about
B.
to think about
C.
think about
D.
thinking about
【单选题】Myths are early science because they ______.
A.
explain the natural events
B.
teach about the history
C.
have nothing to do with religion
D.
reflect people's expectations
【简答题】A 石膏与知母 B 黄芪与茯苓 C 半夏与生姜 D 人参与莱菔子 E 甘草与海藻 属于相恶配伍的是() 属于相须配伍的是()
【单选题】What is the main purpose of this letter?
A.
To explain a new recycling policy
B.
To warn about inappropriate waste disposal
C.
To inform. about a schedule revision
D.
To promote a new garbage collection service
【单选题】The author discusses the five writers mainly to explain some of their beliefs about _____.
A.
the relationship of humans to the external nature.
B.
the immense difficulties involved in self-realization.
C.
the emphasis upon the individual as an universal one.
D.
the human nature and its dependency on the world and universe.
【单选题】The president should explain to the employees about the special_____the company will get through this contract.
A.
factors
B.
benefits
C.
interests
D.
regulations
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