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【简答题】
vi 编辑器具有三种工作模式:命令模式、( ) 和( ),在 vi 编辑环境下,使用( ) 进行模式转换,在用 vi 编辑文件时,将文件内容存入 test.txt 文件中,命令模式下键入( )。
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【单选题】Which one is not the reason why Afghanistan government can not eliminate opium quickly?
A.
Opium is closely related with the economy situation of Afghanistan people
B.
It is a hard job which needs time
C.
Afghanistan is not a democratic country
D.
It is a problem left by history and it need more patience
【简答题】附图中A、B间电压U=100V，R 1 =1Ω，R 2 =3Ω， =4Ω， ，求以A、B为端点的二端网络的复阻抗、阻抗、阻抗角以及电流i和电压 u AD 。的有效值．
【单选题】如下哪一个问题是解线性方程组
A.
已知系数 a,b,c 求抛物线 y= ax2+bx+c 与x轴的交点坐标。
B.
已知抛物线 y=ax2+bx+c 上三点的坐标，求a,b,c.
【单选题】RLC串联谐振电路中,电阻两端电压____总电压,电感与电容两端电压相等,相位相反,且为总电压的____倍,谐振阻抗表达式为______。
A.
不等于, Q,
B.
等于,Q,
C.
等于, 1/Q,
D.
不等于,1/Q,
【单选题】下列关于乳腺癌的描述，错误的是
A.
粉刺癌多位于乳腺中央部位
B.
小叶原位癌多有间质的炎症反应和纤维组织增生
C.
佩吉特病的乳头和乳晕呈湿疹样改变
D.
浸润性导管癌是最常见的乳腺癌类型
【单选题】Which one is NOT the reason for the airtight security at the data center?
A.
There are dangers posed by hackers.
B.
There is only one Visa center in North America.
C.
There is considerable growth in mobile purchases.
D.
There are a large number of daily transactions processed here.
【单选题】Among the following which one is not the negative consequence according to the passage?
A.
The kids are emotionally fragile and they can't stand on their own.
B.
They don't know how to make sound decisions.
C.
They aren't equipped to deal with failure and frustration.
D.
They are lucky to have their parents aroun
【简答题】习题1-1 在图 1-1 所示电路中,已知 R 2 = R 4 , U AD = 15V , U CE = 10V ,试用电位差的概念计算 U AB 。
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