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【单选题】
三极管3DG6是( )三极管。A.
PNP型锗
B.
NPN型锗
C.
PNP型硅
D.
NPN型硅
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举一反三
【单选题】My______ brother is three years ______than I.
A.
older, elder
B.
elder, elder
C.
elder, older
【单选题】Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively areas such as attention and memory. This is true regard...
A.
whose minds are alert and receptive
B.
who are highly intelt
C.
who can remember large amounts of information
D.
who are good at recognizing different sounds
【单选题】My brother is three years than I .
A.
elder, elder
B.
older, older
C.
older, elder
D.
elder, older
【单选题】Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively in cognitive areas such as attention and memory. This i...
A.
who can remember large amounts of information
B.
who are highly intelt
C.
whose minds are alert and receptive
D.
who are good at recognizing different sounds
【简答题】阅读短文，根据短文内容选择正确答案。 My name is Peter．I am 12．I have one brother and one sister．My brother is 15 and my sister is 9．I have a friend．He is an English boy．His name is Tanaka．He is in my class．I have a dog...
【单选题】某一混悬剂50ml置刻度量筒中，起始高度为400px，2小时后沉降面高度为300px，3小时后沉降面高度为240px，则其沉降体积比为：
A.
50%
B.
60%
C.
75%
D.
40%
【简答题】对于JK触发器,若使得Q的状态从0态到1态,则应加的信号是J=____、K=____。
【单选题】某一混悬剂50ml置刻度量筒中,起始高度为16cm,2小时后沉降面高度为12cm,3小时后沉降面高度为9.6cm,则其沉降体积比为:
A.
50%
B.
60%
C.
75%
D.
40%
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