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【单选题】
病人呕吐清水痰涎者多属A.
寒呕
B.
热呕
C.
伤食
D.
痰饮
E.
肝胆郁热
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【单选题】对一个含电源的二端网络，用内阻为 50k Ω 的电压表测得它的端口电压为 30V ，用内阻为 100k Ω 的电压表测得的端口电压为50V，则这个网络的戴维南等效电路的参数为 。
A.
100V 150kΩ
B.
80V 80KΩ
C.
150V 200kΩ
D.
200V 300kΩ
【简答题】有一二端网络，用一内阻为10^5Ω的电压表测得其端电压为45V，若换用一内阻为5*10^4Ω的电压表来测，则测得的端电压为30V，则该网络端电压的真实数值为( )V。
【单选题】有一二端网络，用一内阻为【图片】的电压表测得其端电压为45V，若换用一内阻为【图片】的电压表来测，则测得的端电压为30V，则该网络端电压的真实数值为（ ）。
A.
45V
B.
30V
C.
90V
D.
60V
【简答题】Why
was the little girl not panicked?A. Because she was blind and deaf. B. Because she didn't hear the grave news. C. Because she was too small to know anything. D. Because she was fixed and intent on...
【判断题】用电压表测电压，电压表显示的是电池端电压而不是电池的电动势，其原因是由于电池的内阻不为零，流经电压表的电流在电池内产生内压降，只有当电池内电流为零时，电池两端电压才等于电动势。
A.
正确
B.
错误
【简答题】计算题：有一个直流有源二端网络，用内电阻 R′ b ＝50kΩ的电压表测得它两端的电压Uab＝100V，用内电阻为R″ b ＝150kΩ的电压表测得它两端的电压U ab ＝150V，求这个网络的等效电压源E 0 和R 0 。
【简答题】如图1-93所示电路,开路时测得某直流电源端电压为24V,接上外接电阻R后,用电压表测得R两端电压为20V,用电流表测得流经R的电流I=10A,求电阻R及电源内阻Rs。
【单选题】用电压表测量高内阻电路端电压,已知电路的端电压为5V,输出等效内阻为100kΩ,若选用的电压表内阻为1MΩ,对应的数字电压表测得的电压为( )。
A.
4.9V
B.
4.8V
C.
4.5V
D.
4.2V
【单选题】Why was the little boy disappointed?
A.
He couldn’t get a football shirt from Messi.
B.
His family was too poor to buy him a football.
C.
He couldn’t get a football shirt to look like Messi.
D.
His family cannot afford to pay for football lessons.
【单选题】Why was the little boy disappointed?
A.
He couldn’t get a football shirt from Messi.
B.
He couldn’t get a football shirt to look like Messi.
C.
His family was too poor to buy him a football.
D.
His family cannot afford to pay for football lessons.
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