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【单选题】
comfort
A.
安慰;舒适 形容词是comfortable
B.
反义词是discomfort
C.
Both A and B
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【单选题】The Lakers' forward Kobe Bryant has scored 50 or more points in four straight games, second in the NBA only to Wilt Chamberlain's seven. He also now is tied with Michael Jordan for second with four be...
A.
Kobe Bryant is the second in the NBA for what he got 50 or more points in four games.
B.
Wilt Chamberlain used to get 60 or more points in seven straight games, first in the NBA.
C.
Michael Jordan is in the third place with four behind Chamberlain's 32 in most 60-point games.
D.
Michael Jordan is equal to Kobe Bryant in most 60-point games.
【单选题】根据《环保法》的规定,公民应当增强()意识,采取( )的生活方式,自觉履行环境保护义务。
A.
忧患意识 低碳
B.
危机意识 节俭
C.
生态文明 低碳、节俭
D.
环境保护 低碳、节俭
【简答题】若图3(b)中I=-2A,R=3Ω,则U=?
【单选题】—I believe we will have a good time with Miss Green in your birthday party.
A.
aybe. But it is still a question, you know, _______ she can spare time to come.
B.
whether
C.
where
D.
that
E.
which
【简答题】已知 下图 所示电路中 V CC =12V , R C =3K Ω,静态管压降 U CEQ =6V , 并在输出端加负载电阻 R L ,其阻值为 3 KΩ。选择一个合适的答案填入空内。 (1) 该电路的最大不失真输出电压有效值 U om ≈ ( ) ; A.2V B.3V C.6V (2) 当 U i =1mV时,若在不失真的条件下,减小 R w ,则输出电...
【单选题】How long was the journey home for the Polos?
A.
four years
B.
three years
C.
twenty-four years
D.
five years
【简答题】图示电路中Vcc=12V,Rc=3kΩ,静态管压降 V CEQ =6V,并在输出端加负载 R L =3kΩ。选择一个合适的答案填入空内。 (1)该电路的最大不失真输出电压幅值 U om = A. 2V B. 3V C. 6V (2)当 U i =1mV时,若在不失真的条件下,减小 R W ,则输出电压的幅值将 A. 减小 B.不变 C.增大 (3) 当 U i =1mV时,...
【简答题】下图中,Vcc=12V, R b ’ =100kΩ,放大倍数 b=100 ,并记 R b = R b ’ + R w ,问: (1)当输入电压 u i =0时,测得 U BEQ =0.7V, U CEQ =6V,若要基极电流 I BQ =20μA,则: 1 R b 的值约为 R b ≈ kΩ(值取整数) ; 2 R c 的值约为 R c ≈ kΩ (值取整数) . (2)若测得输入电压有效值 u ...
【单选题】如图所示电路中,若U=6V,R=3Ω,则I=__A
A.
2
B.
-2
C.
6
D.
-6
【简答题】在图示电路中 , 已知 V CC =12V, 晶体管的 b = 5 0, R b =100kΩ , R c =1kΩ , 忽略 U BE 。 求 :(1) 画出直流通路 ; (2) 估算静态工作点 I BQ 、 I CQ 和 U CEQ ; ( 3 ) 若测得输入电压有效值 U i=5mV 时 , 输出电压有效值 U O =0.6V, 则电压放大倍数 A U =?
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