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【单选题】
周期性非正弦电路中的平均功率,等于直流分量功率与各次谐波平均功率( )。A.
平方和的平方根
B.
之和
C.
和的平方根
D.
不确定
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举一反三
【简答题】Owing to the sharp advance in cost, we have to adjust our selling prices to the new situation.(英译中)
【简答题】A．It is needed to adjust the temperature of our bodies. B．It is our second need. C．We need it to cover our bodies. D．Weather is changing all the time.
【单选题】对疑似细菌性痢疾患者做微生物检查,下列哪项是错误的:
A.
取脓血便直接涂片染色镜检
B.
分离培养细菌作生化鉴定
C.
取粪便作增菌培养将标本
D.
接种于选择培养基培养
E.
最后进行血清学鉴定
【单选题】We can learn from the passage that______.
A.
both pure scientists and applied scientists are not equally important
B.
the aircraft designer stands for the pure scientist
C.
geophysics and biochemistry are examples of' new specialties
D.
pure scientists are more important
【单选题】对细菌性痢疾患者做微生物检查,下列哪项是错误的:
A.
取脓血便直接涂片染色镜检
B.
接种于选择培养基培养
C.
分离培养细菌作生化鉴定
D.
最后进行血清学鉴定
E.
Sereny 试验可测定细菌侵袭力
【单选题】单选题-对痢疾患者做微生物学检查，下列哪项是错误的
A.
分离培养细菌，作生化鉴定
B.
取粪标本增菌培养
C.
取黏液性或脓血性便涂片，革兰染色镜检
D.
取标本接种于肠道选择培养基培养
E.
最后做血清学鉴定
【简答题】A．It is needed to adjust the temperature of our bodies. B．It is our second need. C．We need it to cover our bodies. D．Weather is changing all the time.
【简答题】Man is able to adjust his behavior. according to ______ by which we can learn what we can get from the environment.
【简答题】A．It is needed to adjust the temperature of our bodies. B．It is our second need. C．We need clothing to cover our bodies. D．Weather is changing all the time.
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