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--- 现在完成时、过去完成一般过去时 基本概念 1.The old man_____ two days after he had been sent to hospital. A. died B. would die C. had died D. has died 2.Old McDonald gave up smoking for a while, but soon to his old way. A. returned B. has returned C. returns D. had returned 3. I ____ my son _____ a doctor, but he wasn’t good enough at science. A. hoped; would become B. had hoped; would become C. had hoped; will become D. hope; will become 4. I ____ to take a good holiday this year, but I wasn’t able to get away. A. hope B. have hoped C. had hoped D. hoped
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【简答题】在全反射现象中,折射角等于 90° 时的入射角叫做 ( )
【简答题】一局部时变电流电路如图所示,方块表示电路元件,给定u 1 =1V,u 2 =2e -t V,u 3 =3sintV,试求电压u 4 。
【单选题】电路如图所示,电源电动势 E =( ) 。
A.
2V
B.
3V
C.
4V
D.
5V
【单选题】电路如图所示,i L =e -2t A,则其端口电压u ab =(    )。
A.
3e -2t V    
B.
2e -2t V    
C.
e -2t V
D.
-2e -2t V
【单选题】《生气通天论》一篇中集中阐释了《黄帝内经》关于()思想。
A.
修身、齐家、治国、平天下
B.
仁义礼智信
C.
天人合一
D.
养生
【判断题】放大电路的闭环增益就是闭环电压增益,两者没有区别。
A.
正确
B.
错误
【单选题】在全反射现象中,我们把折射角等于( ),即刚好发生全反射时的入射角叫做临界角。
A.
90°
B.
80°
C.
180°
D.
60°
【单选题】电源电路如图 所示, 如框 3 所示 VI 的电压,求变压器副边电压 V2 (交流有效值)是多少?
A.
10V
B.
12V
C.
14.4V
D.
18V
E.
20V
F.
9V
【单选题】ZigBee网络中不支持的拓扑结构是哪个?
A.
簇树形拓扑
B.
总线拓扑
C.
星型拓扑
D.
网状(mesh)结构
【简答题】教材P.109第三章财务分析练习题3
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