皮皮学，免费搜题
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搜题
【单选题】
我国乃至世界现存最早、最完整、最全面介绍茶的第一部专着是什么?A.
《大观茶论》
B.
《神农本草》
C.
《茶经》
D.
《天工开物》
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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【简答题】放大电路如图所示，已知Rb1=10kΩ，Rb2=51kΩ，Rc=3kΩ，Re=500Ω，Ucc=12V，β=30，试求： (1)静态工作点ICQ和UCEQ。 (放大电路如图所示， 已知RB1=60kΩ,RB2=20kΩ,RC=3kΩ,RE=2kΩ,RL=6kΩ,UCC=16V,三极管电流放大系数β=60. （1）求静态工作点； （2）求输入电阻Ri、输出电阻Ro和电压放大倍数Au；
【单选题】— Do you think it is a good idea to make friends with your students? — _____, I do. I think it is a great idea. [ ]
A.
Obviously
B.
Really
C.
Generally
D.
Actually
【简答题】分压式偏置共射极放大电路如下图所示。已知RB1=30kΩ，RB2=10kΩ，RC=RE= 2kΩ，RL=3kΩ，UCC=20V，三极管的电流放大系数β=60，计算电压放大倍数。【图片】
【简答题】分压式偏置共射极放大电路如下图所示。已知RB1=30kΩ，RB2=10kΩ，RC=RE= 2kΩ，RL=3kΩ，UCC=20V，三极管的电流放大系数β=60，输入电阻为（ ）KΩ，输出电阻为（ ）KΩ。【图片】
【单选题】— Do you think it is right? — Yes, _____________. [ ]
A.
I don't think so
B.
I do
C.
I think so
【单选题】—Do you think it is easy to learn English well? —I don't think so, but I find interesting to learn this language. [ ]
A.
that
B.
one
C.
this
D.
it
【单选题】—Do you think it is hard for you to learn math well? —Yes. I really want to drop it.
A.
go on learning well
B.
pick it up
C.
give it up
D.
work hard at it
【简答题】问:“销售费用”账户属于哪类账户?
【单选题】—Do you think it is going to rain tonight?
A.
I hope not.
B.
I don't hope so.
C.
I hope it rain.
D.
I don't hope it will.
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【单选题】— Do you think it is right? — Yes, _____________. [ ]
A.
I don't think so
B.
I do
C.
I think so