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【多选题】
LPCVD和PECVD的不同包括:A.
LPCVD 主要采用加热的方式提供化学反应的能量
B.
PECVD主要采用等离子体提供能量
C.
LPCVD温度比较高,只能用于介质的淀积
D.
PECVD温度比较低,适合金属间介质的淀积
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举一反三
【单选题】According to what the author advocates, which of the following groups of people would be considered healthy?
A.
People who have strong muscles as well as slim figures.
B.
People who are not presently experiencing any symptoms of disease.
C.
People who try to be as healthy as possible, regardless of their limitations.
D.
People who can recover from illness even without seeking medical care.
【单选题】图中若电阻参数为R1=10K,R2=10K,Ra=Rb=5K,则其输入输出表达式应为。
A.
Vo=V3+V1
B.
Vo=2V3-V1
C.
Vo=V3+2V1
D.
Vo=V3-V1
【简答题】图4-77为某一集成运放的中间增益级交流通路，若忽略共集电路上限频率的影响，试计算该电路的上限频率f H 。已知R s =1kΩ，I CQ1 =16μA，I CQ2 =550μA，R 1 =50kΩ，R 2 =100Ω，R L =83kΩ为有源负载的等效电阻，T 1 和T 2 两管的参数均为r bb' =50Ω，β=250，C b'e =2pF，ω T =10 9 rad/s。设r ce 忽略不计...
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