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【单选题】
物联网可分为私有物联网(Private IoT)、( )、社区物联网(Community IoT)和混合物联网(Hybrid IoT)4种A.
公司物联网（Com IoT）
B.
公有物联网（Public IoT）
C.
工厂物联网（ factory IoT ）
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反馈参考答案：
举一反三
【单选题】Where is the Choke located?
A.
At the Drilling Spool
B.
Connected to Ram outlet
C.
At the Choke Manifold
D.
At the Standpipe manifold
【单选题】Hearing her mean words，I stood there trembling and trying to ________ tears. [ ]
A.
choke out
B.
choke in
C.
choke back
D.
choke up
【单选题】choke
A.
to speak with a very loud voice
B.
to stop breathing because something is in the throat
C.
a flat bone on each side of the back
D.
something which is very important and must be dealt with before anything else
E.
simple medical treatment that is given as soon as possible to someone who is injured
F.
a hard hit with someone’s hand or a tool
【单选题】两级放大电路,A u1 =-40,A u2 =-50,若输入电压U i =10mV,则输出电压U o 为( )。
A.
-20V
B.
20V
C.
10V
D.
-10V
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