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【单选题】
三极管具有电流放大作用的外部条件是( )。A.
发射结正偏,集电结反偏
B.
发射结反偏,集电结正偏
C.
发射结正偏,集电结正偏
D.
发射结反偏,集电结反偏
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皮皮学刷刷变学霸
举一反三
【单选题】以下对GRE VPN和BGP/MPLS VPN描述正确的有（）。
A.
都可以分隔地址空间
B.
都是点对点的隧道
C.
GRE VPN能够分隔地址空间，BGP/MPLS VPN不能分隔地址空间
D.
GRE VPN不能分隔地址空间，BGP/MPLS VPN能分隔地址空间
【单选题】disconnect
A.
v. （使）脱离（关系）；（使）不联系
B.
n. 自身；本身；自己；自我
C.
a. 市郊的；郊区的
D.
n. [C, U] 幼儿园；学前班
【简答题】用所给动词的适当形式填空。 1. I saw the boy ________ (play) football when I looked out of the window. 2. It’s important ________ (not give) goldfish too much food. 3. Children shouldn't spend too much time _______...
【单选题】When Olson say “We’re really there for when the processes fall down” (Line 4, Para. 5), she means that
A.
they will provide help whenever taxpayers make claims.
B.
they will get involved in the normal appeals process.
C.
they will offer counseling when citizen calls.
D.
they will give help when procedural problems occur.
【单选题】When we are studying the behavior of buyers, we are studying
A.
supply
B.
demand
C.
an entire market.
D.
government regulation.
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