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【单选题】
在放大电路中若要增大输入电阻,稳定输出电流,可以引入 ( ) 负反馈。A.
电压串联
B.
电压并联
C.
电流串联
D.
电流并联
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】What can we learn from this book?
A.
Her life story.
B.
The ideas how she ran the company.
C.
BothAandB
【单选题】________ she ran to the classroom, the teacher had begun the class.
A.
What time
B.
By the time
C.
At the time
D.
During the time
【单选题】She ran to the hospital________ she heard the bad now.
A.
at the moment
B.
the moment
C.
in a moment
D.
do the moment
【单选题】When Julie ______ the technical instructions, she ran the risk of multiple errors because she was not specific enough.
A.
generalized
B.
issued
C.
followed
D.
demonstrated
【简答题】选修4-2：矩阵与变换 设矩阵 M= 1 a b 1 ． （I）若a=2，b=3，求矩阵M的逆矩阵M -1 ； （Ⅱ）若曲线C：x 2 +4xy+2y 2 =1在矩阵M的作用下变换成曲线C'：x 2 -2y 2 =1，求a+b的值．
【简答题】SWOT是一个通用分析工具,可以用来评价商业项目,也可以用于人生、事业、就业等方面的分析,其中S指( ),W指( ),O指( ),T指( )。
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