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【单选题】
下列属于抑菌药的是A.
青霉素类
B.
头孢菌素类
C.
氨基糖苷类
D.
磺胺类
E.
氟喹诺酮类
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举一反三
【单选题】听力原文： Robert Goddard, American physicist and rocket scientist, once said that the dream of yesterday is the hope of today and the reality of tomorrow. It was his scientific work that gave hope to many...
A.
An airplane designer.
B.
A science fiction writer.
C.
The inventor of rockets.
D.
A famous theoretical physicist.
【单选题】某具有内阻的直流电源与负载电阻构成的简单供电网络如图,E=230 V,R0=0.1Ω,RL=2.2 Ω;若在SA闭合时,电路中的工作电流为______。
A.
2 300 A
B.
100 A
C.
105 A
D.
∞
【单选题】某具有内阻的直流电源与负载电阻构成的简单供电网络如图,当开关SA打开及闭合时,电压表的读数分别为12 V、10 V,若RL= 2 Ω,则内阻R0 =()
A.
2 Ω
B.
0.2 Ω
C.
0.4 Ω
D.
0.33 Ω
【单选题】Robert Pianta said he was interested in knowing______.
A.
where the whole industry was moving to
B.
whether theres some real innovation in there
C.
how much money the whole industry would earn
D.
whether students could get something new
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