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【单选题】
--He llo! Could I speak to Mr Smith? --__________. Please call back later.A.
Wait a minute
B.
Hold on for a mome n t
C.
Speaking
D.
Sorry; he isn't in
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举一反三
【单选题】As shown in the figure, the circuit is in a steady state. When t=0, the switch S is suddenly turned on (cut off the circuit). The initial voltage on the inductor is uL(0+)=________V. Choose A,B,C or D...
A.
0
B.
3
C.
-6
D.
6
【单选题】When the switch S in the circuit shown is closed, the time constant for the growth of current in R2 is:
A.
L/R2
B.
L(R1 + R2)/(R1R2)
C.
(L/R1 + L/R2)/2
D.
L/(R1 + R2)
【单选题】When Tron-30s beacon in the upright position is put into water ,transmission will start independent of the switch ______ the beacon.
A.
at the bottom of
B.
at the top of
C.
at the left of
D.
at the right side of
【单选题】When Tron-30S beacon in the upright position is put into water, transmission will start independent of the switch the beacon.
A.
at the bottom of
B.
at the top of
C.
at the left side of
D.
at the right side of
【单选题】范式理论中的第三范式是指（ ）。
A.
属于第二范式，关键字属性都彼此函数独立
B.
属于第二范式，非关键字属性都彼此函数依赖
C.
属于第二范式，非关键字属性都彼此函数独立
D.
属于第二范式，关键字属性都彼此函数依赖
【简答题】图片上展示的是中国十大名茶,请问它们分别是哪类茶? 西湖龙井是(),洞庭碧螺春是(),黄山毛峰是(),庐山云雾茶是(),六安瓜片是(),君山银针是(),信阳毛尖是(),武夷岩茶是(),安溪铁观音是(),祁门工夫是()。
【简答题】中国十大名茶分别是哪类茶? 西湖龙井是(),洞庭碧螺春是(),黄山毛峰是(),庐山云雾茶是(),六安瓜片是(),君山银针是(),信阳毛尖是(),武夷岩茶是(),安溪铁观音是(),祁门工夫是()。
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